57120831 has 12 divisors (see below), whose sum is σ = 84520800. Its totient is φ = 37151520.

The previous prime is 57120829. The next prime is 57120841. The reversal of 57120831 is 13802175.

It is not a de Polignac number, because 57120831 - 2¹ = 57120829 is a prime.

It is a super-2 number, since 2×57120831² = 6525578668261122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 57120795 and 57120804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57120841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77031 + ... + 77768.

It is an arithmetic number, because the mean of its divisors is an integer number (7043400).

Almost surely, 2^57120831 is an apocalyptic number.

57120831 is a deficient number, since it is larger than the sum of its proper divisors (27399969).

57120831 is a wasteful number, since it uses less digits than its factorization.

57120831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154846 (or 154843 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 57120831 is about 7557.8324273564. The cubic root of 57120831 is about 385.1218616880.

The spelling of 57120831 in words is "fifty-seven million, one hundred twenty thousand, eight hundred thirty-one".