256617231 has 8 divisors (see below), whose sum is σ = 368476080. Its totient is φ = 157918272.

The previous prime is 256617223. The next prime is 256617247. The reversal of 256617231 is 132716652.

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

It is not a de Polignac number, because 256617231 - 2³ = 256617223 is a prime.

It is a super-2 number, since 2×256617231² = 131704806492214722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256617192 and 256617201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256617271) 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 7 ways as a sum of consecutive naturals, for example, 3289926 + ... + 3290003.

It is an arithmetic number, because the mean of its divisors is an integer number (46059510).

Almost surely, 2^256617231 is an apocalyptic number.

256617231 is a deficient number, since it is larger than the sum of its proper divisors (111858849).

256617231 is a wasteful number, since it uses less digits than its factorization.

256617231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6579945.

The product of its digits is 15120, while the sum is 33.

The square root of 256617231 is about 16019.2768563378. The cubic root of 256617231 is about 635.4703201339.

The spelling of 256617231 in words is "two hundred fifty-six million, six hundred seventeen thousand, two hundred thirty-one".