256319131 has 2 divisors, whose sum is σ = 256319132. Its totient is φ = 256319130.

The previous prime is 256319123. The next prime is 256319171. The reversal of 256319131 is 131913652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256319131 - 2³ = 256319123 is a prime.

It is a super-2 number, since 2×256319131² = 131398993833190322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256319093 and 256319102.

It is not a weakly prime, because it can be changed into another prime (256319111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128159565 + 128159566.

It is an arithmetic number, because the mean of its divisors is an integer number (128159566).

Almost surely, 2^256319131 is an apocalyptic number.

256319131 is a deficient number, since it is larger than the sum of its proper divisors (1).

256319131 is an equidigital number, since it uses as much as digits as its factorization.

256319131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 31.

The square root of 256319131 is about 16009.9697376354. The cubic root of 256319131 is about 635.2241596025.

The spelling of 256319131 in words is "two hundred fifty-six million, three hundred nineteen thousand, one hundred thirty-one".