113 is the natural number following 112 and preceding 114. Natural number can mean either a positive integer (1, 2, 3, 4, ...) or a non-negative integer (0, 1, 2, 3, 4, ...). Natural numbers have two main purposes: they can be used for counting (there are 3 apples on the table), and they can be used for ordering (this is... 112 is the natural number following 111 and preceding 113. ... 114 (one hundred [and] fourteen) is the natural number following 113 and preceding 115. ...

One hundred thirteen is the 30th prime number, following 109 and preceding 127, a Sophie Germain prime, a Chen prime, a primeval number, and a permutable prime with 131 and 311. 113 is an Eisenstein prime with no imaginary part and real part of the form 3n − 1. 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 represents numeric values using two symbols, typically 0 and 1. ... In mathematics and computer science, 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, a prime number (or prime) is a natural number greater than one whose only positive divisors are one and itself. ... 109 is the natural number following 108 and preceding 110. ... 127 is the natural number following 126 and preceding 128. ... A prime number p is called a Sophie Germain prime if 2p + 1 is also prime. ... A prime number p is called a Chen prime if p + 2 is either a prime or a semiprime. ... In mathematics, a primeval number is a natural number n for which the number of prime numbers which can be obtained by permuting all or some of its digits (in base 10) is larger than the number of primes obtainable in the same way for any smaller natural number. ... A permutable prime is a prime number, which, in a given base, can have its digits switched to any possible permutation and still spell a prime number. ... 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. ...

In mathematics

It is a highly cototient number and a centered square number. 355/113 approximates pi to seven decimal places, with an error of less that 1/113³. 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. ... A centered square number is a centered figurate number that represents a square with a dot in the center and all other dots surrounding the center up to a certain city block distance, i. ... Lower-case pi The mathematical constant Ï€ is the ratio of a circles circumference (Greek περιφέρεια, periphery) to its diameter and is commonly used in mathematics, physics, and engineering. ...

In other fields

• The atomic number of an element temporarily called ununtrium.
• The number of surat al-Falaq in the Qur'an.
• The emergency telephone number in Italy.
• Part of an in-joke on some Disney movies. See A113.

• The year AD 113 or 113 BC.