856317231 has 64 divisors (see below), whose sum is σ = 1587548160. Its totient is φ = 443184480.

The previous prime is 856317211. The next prime is 856317239. The reversal of 856317231 is 132713658.

It is not a de Polignac number, because 856317231 - 2⁵ = 856317199 is a prime.

It is a super-2 number, since 2×856317231² = 1466558400215014722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856317239) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 720820 + ... + 722006.

It is an arithmetic number, because the mean of its divisors is an integer number (24805440).

Almost surely, 2^856317231 is an apocalyptic number.

856317231 is a deficient number, since it is larger than the sum of its proper divisors (731230929).

856317231 is a wasteful number, since it uses less digits than its factorization.

856317231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561 (or 1555 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 856317231 is about 29262.8985406436. The cubic root of 856317231 is about 949.6091581537.

The spelling of 856317231 in words is "eight hundred fifty-six million, three hundred seventeen thousand, two hundred thirty-one".