56557251 has 32 divisors (see below), whose sum is σ = 85962240. Its totient is φ = 36741600.

The previous prime is 56557247. The next prime is 56557289. The reversal of 56557251 is 15275565.

It is a happy number.

56557251 is a `hidden beast` number, since 56 + 557 + 2 + 51 = 666.

It is not a de Polignac number, because 56557251 - 2² = 56557247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56557211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 312381 + ... + 312561.

It is an arithmetic number, because the mean of its divisors is an integer number (2686320).

Almost surely, 2^56557251 is an apocalyptic number.

56557251 is a deficient number, since it is larger than the sum of its proper divisors (29404989).

56557251 is a wasteful number, since it uses less digits than its factorization.

56557251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 418 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 56557251 is about 7520.4555048215. The cubic root of 56557251 is about 383.8510775064.

The spelling of 56557251 in words is "fifty-six million, five hundred fifty-seven thousand, two hundred fifty-one".