57312013 has 12 divisors (see below), whose sum is σ = 63239904. Its totient is φ = 51900200.

The previous prime is 57311983. The next prime is 57312019. The reversal of 57312013 is 31021375.

It is a de Polignac number, because none of the positive numbers 2^k-57312013 is a prime.

It is a super-2 number, since 2×57312013² = 6569333668224338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57312019) 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, 36870 + ... + 38392.

It is an arithmetic number, because the mean of its divisors is an integer number (5269992).

Almost surely, 2^57312013 is an apocalyptic number.

It is an amenable number.

57312013 is a deficient number, since it is larger than the sum of its proper divisors (5927891).

57312013 is a wasteful number, since it uses less digits than its factorization.

57312013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856 (or 1845 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 57312013 is about 7570.4698004813. The cubic root of 57312013 is about 385.5510476480.

Adding to 57312013 its reverse (31021375), we get a palindrome (88333388).

It can be divided in two parts, 5731 and 2013, that added together give a square (7744 = 88²).

The spelling of 57312013 in words is "fifty-seven million, three hundred twelve thousand, thirteen".