56257531 has 4 divisors (see below), whose sum is σ = 61371864. Its totient is φ = 51143200.

The previous prime is 56257511. The next prime is 56257547. The reversal of 56257531 is 13575265.

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 56257531 - 2¹³ = 56249339 is a prime.

It is a super-2 number, since 2×56257531² = 6329819588431922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56257511) 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, 2557150 + ... + 2557171.

It is an arithmetic number, because the mean of its divisors is an integer number (15342966).

Almost surely, 2^56257531 is an apocalyptic number.

56257531 is a deficient number, since it is larger than the sum of its proper divisors (5114333).

56257531 is a wasteful number, since it uses less digits than its factorization.

56257531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5114332.

The product of its digits is 31500, while the sum is 34.

The square root of 56257531 is about 7500.5020498631. The cubic root of 56257531 is about 383.1718149192.

The spelling of 56257531 in words is "fifty-six million, two hundred fifty-seven thousand, five hundred thirty-one".