57931 has 4 divisors (see below), whose sum is σ = 61000. Its totient is φ = 54864.

The previous prime is 57923. The next prime is 57943. The reversal of 57931 is 13975.

57931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57931 - 2³ = 57923 is a prime.

It is a super-2 number, since 2×57931² = 6712001522, 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 = 57896 and 57905.

It is not an unprimeable number, because it can be changed into a prime (57901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1506 + ... + 1543.

It is an arithmetic number, because the mean of its divisors is an integer number (15250).

2⁵⁷⁹³¹ is an apocalyptic number.

57931 is a deficient number, since it is larger than the sum of its proper divisors (3069).

57931 is a wasteful number, since it uses less digits than its factorization.

57931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3068.

The product of its digits is 945, while the sum is 25.

The square root of 57931 is about 240.6885954922. The cubic root of 57931 is about 38.6934102871.

Subtracting from 57931 its reverse (13975), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 57931 in words is "fifty-seven thousand, nine hundred thirty-one".