256504892131 has 2 divisors, whose sum is σ = 256504892132. Its totient is φ = 256504892130.

The previous prime is 256504892117. The next prime is 256504892167. The reversal of 256504892131 is 131298405652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256504892131 - 2¹³ = 256504883939 is a prime.

It is a super-2 number, since 2×256504892131² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256504892431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128252446065 + 128252446066.

It is an arithmetic number, because the mean of its divisors is an integer number (128252446066).

Almost surely, 2^256504892131 is an apocalyptic number.

256504892131 is a deficient number, since it is larger than the sum of its proper divisors (1).

256504892131 is an equidigital number, since it uses as much as digits as its factorization.

256504892131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 256504892131 in words is "two hundred fifty-six billion, five hundred four million, eight hundred ninety-two thousand, one hundred thirty-one".