57257531 has 4 divisors (see below), whose sum is σ = 57280992. Its totient is φ = 57234072.

The previous prime is 57257521. The next prime is 57257549. The reversal of 57257531 is 13575275.

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 57257531 - 2¹⁴ = 57241147 is a prime.

It is a super-2 number, since 2×57257531² = 6556849712431922, 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 = 57257491 and 57257500.

It is not an unprimeable number, because it can be changed into a prime (57257521) 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, 7580 + ... + 13113.

It is an arithmetic number, because the mean of its divisors is an integer number (14320248).

Almost surely, 2^57257531 is an apocalyptic number.

57257531 is a deficient number, since it is larger than the sum of its proper divisors (23461).

57257531 is a wasteful number, since it uses less digits than its factorization.

57257531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23460.

The product of its digits is 36750, while the sum is 35.

The square root of 57257531 is about 7566.8706213335. The cubic root of 57257531 is about 385.4288379476.

The spelling of 57257531 in words is "fifty-seven million, two hundred fifty-seven thousand, five hundred thirty-one".