131 (number)

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131 is the natural number following 130 and preceding 132.

<< 130 131 132 133 134 135 136 137 138 139 >> List of numbers — Integers ← 100 110 120 130 140 150 160 170 180 190 →
Cardinal	One hundred [and] thirty-one
Ordinal	131st
Factorization	prime
Roman numeral	CXXXI
Binary	10000011
Hexadecimal	83

[edit] In mathematics

131 is a Sophie Germain prime, the second 3-digit palindromic prime, and also a permutable prime with 113 and 311. It can be expressed as the sum of three consecutive primes, 131 = 41 + 43 + 47. 131 is an Eisenstein prime with no imaginary part and real part of the form 3n − 1. Because the next odd number, 133, is a semiprime, 131 is a Chen prime.

131 is a full reptend prime in base 10. The decimal expansion of 1/131 repeats the digits 0076335877862595419847328244274809160305343511450381679389312977099236641221374045801526717557251908396946564885496183206106870229 indefinitely.

[edit] In other fields

• The year 131 and 131 BC.