89 (eighty-nine) is the natural number following 88 and preceding 90. In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... 88 (eighty-eight) is the natural number following 87 and preceding 89. ... 90 (ninety) is the natural number preceded by 89 and followed by 91. ...

Aleph-0, the smallest infinite cardinal In mathematics, cardinal numbers, or cardinals for short, are a generalized kind of number used to denote the size of a set, known as its cardinality. ... In set theory, ordinal, ordinal number, and transfinite ordinal number refer to a type of number introduced by Georg Cantor in 1897, to accommodate infinite sequences and to classify sets with certain kinds of order structures on them. ... ... In mathematics, a divisor of an integer n, also called a factor of n, is an integer which evenly divides n without leaving a remainder. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ... In mathematics and computer science, hexadecimal, base-16, or simply hex, is a numeral system with a radix, or base, of 16, usually written using the symbols 0–9 and A–F, or a–f. ...

In mathematics

Eighty-nine is the 24th prime number, following 83 and preceding 97. 89 is a Chen prime. It is the smallest Sophie Germain prime to start a Cunningham chain of the first kind of six terms, {89, 179, 359, 719, 1439, 2879}. 89 is an Eisenstein prime with no imaginary part and real part of the form 3n − 1. In mathematics, a prime number (or a prime) is a natural number which has exactly two distinct natural number divisors: 1 and itself. ... 83 (eighty-three) is the natural number following 82 and preceding 84. ... 97 is the natural number following 96 and preceding 98. ... A prime number p is called a Chen prime if p + 2 is either a prime or a product of two primes. ... A prime number p is called a Sophie Germain prime if 2p + 1 is also prime. ... In mathematics, a Cunningham chain is a certain sequence of prime numbers. ... An Eisenstein prime is an Eisenstein integer aω + b that has only two Eisenstein divisors, the complex cube root of unity and aω + b itself. ...

89 is a Fibonacci number. Its reciprocal has a curious relationship to the Fibonacci sequence F(n): A tiling with squares whose sides are successive Fibonacci numbers in length A Fibonacci spiral, created by drawing arcs connecting the opposite corners of squares in the Fibonacci tiling shown above – see golden spiral In mathematics, the Fibonacci numbers form a sequence defined by the following recurrence relation: That is...

89 is also a Markov number, appearing in solutions to the Markov Diophantine equation with other odd-indexed Fibonacci numbers. A Markov number or Markoff number is an integer x, y or z that is part of a solution to the Markov Diophantine equation The first few Markov numbers are 1, 2, 5, 13, 29, 34, 89, 169, 194, 233, 433, 610, 985, 1325, ... (sequence A002559 in OEIS) appearing in...

Being the solution to x - φ(x) more often than any lower number, 89 is a highly cototient number. In number theory, a branch of mathematics, a highly cototient number k is an integer that has more solutions to the equation x - φ(x) = k, where φ is Eulers totient function, than any integer below it, with the exception of 1. ...

Although 89 is a prime number, all of its digits,(8,9), are composite.

Although 89 is not a Lychrel number in base 10, it is unusual that it takes 24 iterations of the reverse and add process to reach a palindrome. Among the known non-Lychrel numbers in the first 10000 integers, no other number requires that many or more iterations. The palindrome reached is also unusually large.^[1] A Lychrel number is a natural number which cannot form a palindrome through the iterative process of repeatedly reversing its digits and adding the resulting numbers. ...

In science

• The atomic number of actinium.

See also: List of elements by atomic number In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom. ... General Name, Symbol, Number actinium, Ac, 89 Chemical series actinides Group, Period, Block 3, 7, f Appearance silvery Standard atomic weight (227) g·mol−1 Electron configuration [Rn] 6d1 7s2 Electrons per shell 2, 8, 18, 32, 18, 9, 2 Physical properties Phase solid Density (near r. ...

In astronomy

• Messier object M89, a magnitude 11.5 elliptical galaxy in the constellation Virgo.
• The New General Catalogue object NGC 89, a magnitude 13.5 peculiar spiral galaxy in the constellation Phoenix and a member of Robert's Quartet.

The Messier objects are a set of astronomical objects catalogued by Charles Messier in his catalogue of Nebulae and Star Clusters first published in 1774. ... Elliptical Galaxy M89 (also known as Messier Object 89, Messier 89, M89, or NGC 4552) is an elliptical galaxy in the Virgo constellation. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... The giant elliptical galaxy ESO 325-G004. ... This article is about the star grouping. ... Virgo (pronounced , Latin: , symbol , ) is a constellation of the zodiac. ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ... A peculiar galaxy is a galaxy which is unusual in its size, shape, or composition. ... An example of a spiral galaxy, the Pinwheel Galaxy (also known as Messier 101 or NGC 5457) A spiral galaxy is a galaxy belonging to one of the three main classes of galaxy originally described by Edwin Hubble in his 1936 work “The Realm of the Nebulae”[1] and, as... Phoenix (IPA: ) is a minor southern constellation, introduced by Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman, and popularized by Johann Bayers Uranometria in 1603. ... Roberts Quartet is a compact galaxy group approximately 160 million light-years away in the constellation Phoenix. ...

In other fields

TI-89

Eighty-nine is also: Download high resolution version (960x2000, 1298 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (960x2000, 1298 KB) Wikipedia does not have an article with this exact name. ... A TI-89 The TI-89 and the TI-89 Titanium are graphing calculators developed by Texas Instruments. ...

• A jersey number of a Russian and NHL hockey legend Alexander Mogilny
• Part of the name of the baseball team Oklahoma City 89ers (1962-1997)
• The designation of Interstate 89, a freeway that runs from New Hampshire to Vermont
• The ISBN Group Identifier for books published in Korea
• Pop Song 89
• The year AD 89, 89 BC
• California Proposition 89, a 2006 California ballot initiative on campaign finance reform
• The Oklahoma Redhawks were formerly known as the Oklahoma 89ers.
• In Rugby, a "89" or eight-nine move is a phase following a scrum, in which the number 8 catches the ball and transfers it to number 9 (scrum half).
• The greatest number of verses in a chapter of a book of the Bible other than the Book of Psalms--specifically Numbers chapter 7.

Alexander Mogilny (Александр Геннадиевич Могильный, Aleksandr Gennadijevič Mogilnyj) born on February 18, 1969, in Khabarovsk, USSR (now Russia) is a professional ice hockey player. ... Categories: Baseball stubs | Minor league baseball teams | Oklahoma sports | Texas Rangers ... Interstate 89 (abbreviated I-89) is an interstate highway in the New England portion of the United States. ... For other uses, see New Hampshire (disambiguation). ... This article is about the U.S. state. ... The International Standard Book Number, or ISBN (sometimes pronounced is-ben), is a unique[1] identifier for books, intended to be used commercially. ... This article is about the Korean civilization. ... Pop Song 89 was the third single released from R.E.M.s sixth studio album Green. ... This article is about the year 89. ... Centuries: 2nd century BC - 1st century BC - 1st century Decades: 130s BC 120s BC 110s BC 100s BC 90s BC - 80s BC - 70s BC 60s BC 50s BC 40s BC 30s BC Years: 94 BC 93 BC 92 BC 91 BC 90 BC - 89 BC - 88 BC 87 BC 86... // Proposition 89 was a failed 2006 California ballot initiative that would have offered clean elections centered on campaign finance reform. ... Texas Rangers American League AAA Oklahoma RedHawks AA Frisco RoughRiders A Bakersfield Blaze Clinton LumberKings Spokane Indians R Arizona Rangers The Oklahoma RedHawks are a minor league baseball team based in Oklahoma City, Oklahoma. ... Rugby union is a team sport played between two teams of fifteen players. ... Look up number in Wiktionary, the free dictionary. ...

References

1. ^ Weisstein, Eric W. "196-Algorithm." From MathWorld, a Wolfram Web Resource. http://mathworld.wolfram.com/196-Algorithm.html