256695131 has 8 divisors (see below), whose sum is σ = 320035584. Its totient is φ = 200022120.

The previous prime is 256695041. The next prime is 256695161. The reversal of 256695131 is 131596652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256695131 is a prime.

It is a super-2 number, since 2×256695131² = 131784780558214322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256695161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1666775 + ... + 1666928.

It is an arithmetic number, because the mean of its divisors is an integer number (40004448).

Almost surely, 2^256695131 is an apocalyptic number.

256695131 is a deficient number, since it is larger than the sum of its proper divisors (63340453).

256695131 is a wasteful number, since it uses less digits than its factorization.

256695131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333721.

The product of its digits is 48600, while the sum is 38.

The square root of 256695131 is about 16021.7081174262. The cubic root of 256695131 is about 635.5346158029.

The spelling of 256695131 in words is "two hundred fifty-six million, six hundred ninety-five thousand, one hundred thirty-one".