53 (fifty-three) is the natural number following 52 and preceding 54. A natural number is either a positive integer (1, 2, 3, 4, ...) or a non-negative integer (0, 1, 2, 3, 4, ...). The former definition is generally used in number theory, while the latter is preferred in set theory and computer science. ... 52 is the natural number following 51 and preceding 53. ... Fifty-four (54) is the natural number following 53 and preceding 55. ...

In linguistics, cardinal numbers is the name given to number words that are used for quantity (one, two, three), as opposed to ordinal numbers, words that are used for order (first, second, third). ... Commonly, ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ... In mathematics, factorization or factoring is the decomposition of an object (for example, a number, a polynomial, or a matrix) into a product of other objects, or factors, which when multiplied together give the original. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system (base 2 numerals) represents numeric values using two symbols, typically 0 and 1. ... In mathematics and computer science, base-16, hexadecimal, 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

Fifty-three is the 16th smallest prime number. The next is fifty-nine. Fifty-three is also a Sophie Germain prime, and the sum of five consecutive primes (5 + 7 + 11 + 13 + 17). It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1. Since 53 is equal to the arithmetic mean of its two neighboring primes, 47 and 59, it is a balanced prime. In mathematics, a prime number (or a prime) is a natural number that has exactly two (distinct) natural number divisors, which are 1 and the prime number itself. ... 59 is the natural number following 58 and preceding 60. ... A prime number p is called a Sophie Germain prime if 2p + 1 is also prime. ... 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. ... A balanced prime is a prime number that is equal to the arithmetic mean of the nearest prime above and below. ...

53 written in hexadecimal is 35, that is, the same characters used in the decimal representation, but reversed. Three multiples of 53 share this property: 371 = 173₁₆, 5141 = 1415₁₆, 99481 = 18499₁₆.

But 53 can not be expressed as the sum of any integer and its base 10 digits, making 53 a self number. A self number or Colombian number is an integer which, in a given base, can not be generated by any other integer added to the sum of its digits. ...

53 is a strictly non-palindromic number. A strictly non-palindromic number is an integer n that is not palindromic in any number base up to n − 2. ...

In science

• The atomic number of iodine.

In astronomy, In chemistry and physics, the atomic number (Z) is the number of protons found in the nucleus of an atom. ... General Name, Symbol, Number iodine, I, 53 Chemical series halogens Group, Period, Block 17, 5, p Appearance violet-dark gray, lustrous Atomic mass 126. ... Radio telescopes are among many different tools used by astronomers Astronomy (Greek: αστρονομία = άστρον + νόμος, astronomia = astron + nomos, literally, law of the stars) is the science of celestial objects and phenomena that originate outside the Earths atmosphere, such as stars, planets, comets, auroras, galaxies, and the cosmic background radiation. ...

• Messier object M53, a magnitude 8.5 globular cluster in the constellation Coma Berenices

• The New General Catalogue object NGC 53, a magnitude 12.6 barred spiral galaxy in the constellation Tucana

• The Saros number of the solar eclipse series which began on -1295 August 26 and ended on 220 February 21. The duration of Saros series 53 was 1514.5 years, and it contained 85 solar eclipses.

• The Saros number of the lunar eclipse series which began on -993 June 5 and ended on 287 July 12. The duration of Saros series 53 was 1280.1 years, and it contained 72 lunar eclipses.

Table of all 110 Messier objects. ... M53 refers to: Messier 53 a Messier object and a globular cluster in the Coma Berenices 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. ... A globular cluster is a spherical bundle of stars (star cluster) that orbits a galaxy as a satellite. ... Orion is a remarkable constellation, visible from most places on the globe at one time or another during the year. ... Coma Berenices (Latin for Berenices Hair) is a traditional asterism that has since become a constellation. ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ... NGC 1300, viewed nearly face-on. ... Tucana (Latin for Toucan) is a southern constellation. ... A Saros cycle is a period of 6585 + 1/3 days (approximately 18 years 10 days and 8 hours) which can be used to predict eclipses of the sun and the moon. ... Photo taken during the 1999 eclipse. ... August 26 is the 238th day of the year in the Gregorian Calendar (239th in leap years). ... Events Han Xiandi abdicates his throne to Cao Pi, symbolizing the end of the Han Dynasty and the beginning of the Three Kingdoms period in China. ... February 21 is the 52nd day of the year in the Gregorian Calendar. ... An eclipse refers to the phenomenon of one body passing into the shadow cast by another body. ... June 5 is the 156th day of the year in the Gregorian calendar (157th in leap years), with 209 days remaining. ... Events Diocletian and Maximian become Roman Consuls Births Deaths Categories: 287 ... July 12 is the 193rd day (194th in leap years) of the year in the Gregorian Calendar, with 172 days remaining. ...

In other fields

Fifty-three is also:

• The code for international direct dial phone calls to Cuba.
• The racing number of Herbie, a Volkswagen Beetle with a mind of his own, first appearing in the 1968 movie The Love Bug.
• In the title of the 1912 movie North of Fifty Three, remade in 1917.
• The jersey number of Los Angeles Dodgers pitcher Don Drysdale.
• The number of short poems in the book Rumi Birdsong by Jelaluddin Rumi.
• The year AD 53, 53 BC, and 1953.
• The name of a webcomic by Daniel Creamer. See Number 53 (webcomic)