256170231 has 6 divisors (see below), whose sum is σ = 370023680. Its totient is φ = 170780148.

The previous prime is 256170223. The next prime is 256170259. The reversal of 256170231 is 132071652.

It is a happy number.

256170231 is a `hidden beast` number, since 2 + 561 + 70 + 2 + 31 = 666.

It is not a de Polignac number, because 256170231 - 2³ = 256170223 is a prime.

It is a super-2 number, since 2×256170231² = 131246374501186722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256170195 and 256170204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256170281) 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 in 5 ways as a sum of consecutive naturals, for example, 14231671 + ... + 14231688.

Almost surely, 2^256170231 is an apocalyptic number.

256170231 is a deficient number, since it is larger than the sum of its proper divisors (113853449).

256170231 is a wasteful number, since it uses less digits than its factorization.

256170231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28463365 (or 28463362 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 256170231 is about 16005.3188346874. The cubic root of 256170231 is about 635.1011317216.

It can be divided in two parts, 25 and 6170231, that added together give a square (6170256 = 2484²).

The spelling of 256170231 in words is "two hundred fifty-six million, one hundred seventy thousand, two hundred thirty-one".