56257521 has 4 divisors (see below), whose sum is σ = 75010032. Its totient is φ = 37505012.

The previous prime is 56257511. The next prime is 56257547. The reversal of 56257521 is 12575265.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56257521 - 2⁷ = 56257393 is a prime.

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, 9376251 + ... + 9376256.

It is an arithmetic number, because the mean of its divisors is an integer number (18752508).

Almost surely, 2^56257521 is an apocalyptic number.

It is an amenable number.

56257521 is a deficient number, since it is larger than the sum of its proper divisors (18752511).

56257521 is a wasteful number, since it uses less digits than its factorization.

56257521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18752510.

The product of its digits is 21000, while the sum is 33.

The square root of 56257521 is about 7500.5013832410. The cubic root of 56257521 is about 383.1717922157.

It can be divided in two parts, 5 and 6257521, that added together give a palindrome (6257526).

The spelling of 56257521 in words is "fifty-six million, two hundred fifty-seven thousand, five hundred twenty-one".