856609831 has 16 divisors (see below), whose sum is σ = 1073899008. Its totient is φ = 663789600.

The previous prime is 856609799. The next prime is 856609867. The reversal of 856609831 is 138906658.

856609831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 856609831 - 2⁵ = 856609799 is a prime.

It is a super-2 number, since 2×856609831² = 1467560805131697122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856609891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16795 + ... + 44668.

It is an arithmetic number, because the mean of its divisors is an integer number (67118688).

Almost surely, 2^856609831 is an apocalyptic number.

856609831 is a deficient number, since it is larger than the sum of its proper divisors (217289177).

856609831 is a wasteful number, since it uses less digits than its factorization.

856609831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61662.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 856609831 is about 29267.8976183804. The cubic root of 856609831 is about 949.7173049901.

The spelling of 856609831 in words is "eight hundred fifty-six million, six hundred nine thousand, eight hundred thirty-one".