256632931 has 2 divisors, whose sum is σ = 256632932. Its totient is φ = 256632930.

The previous prime is 256632913. The next prime is 256632941. The reversal of 256632931 is 139236652.

Together with previous prime (256632913) 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 256632931 - 2¹¹ = 256630883 is a prime.

It is a super-2 number, since 2×256632931² = 131720922547301522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256632941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128316465 + 128316466.

It is an arithmetic number, because the mean of its divisors is an integer number (128316466).

Almost surely, 2^256632931 is an apocalyptic number.

256632931 is a deficient number, since it is larger than the sum of its proper divisors (1).

256632931 is an equidigital number, since it uses as much as digits as its factorization.

256632931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 37.

The square root of 256632931 is about 16019.7668834475. The cubic root of 256632931 is about 635.4832793580.

The spelling of 256632931 in words is "two hundred fifty-six million, six hundred thirty-two thousand, nine hundred thirty-one".