131256431 has 2 divisors, whose sum is σ = 131256432. Its totient is φ = 131256430.

The previous prime is 131256413. The next prime is 131256443. The reversal of 131256431 is 134652131.

Together with previous prime (131256413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131256431 - 2¹⁸ = 130994287 is a prime.

It is a super-2 number, since 2×131256431² = 34456501357715522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131256431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131256481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65628215 + 65628216.

It is an arithmetic number, because the mean of its divisors is an integer number (65628216).

Almost surely, 2^131256431 is an apocalyptic number.

131256431 is a deficient number, since it is larger than the sum of its proper divisors (1).

131256431 is an equidigital number, since it uses as much as digits as its factorization.

131256431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 26.

The square root of 131256431 is about 11456.7199058020. The cubic root of 131256431 is about 508.2064785194.

The spelling of 131256431 in words is "one hundred thirty-one million, two hundred fifty-six thousand, four hundred thirty-one".