131 (number)
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131 is the natural number following 130 and preceding 132.
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.