56521521 has 24 divisors (see below), whose sum is σ = 93550080. Its totient is φ = 32213376.

The previous prime is 56521501. The next prime is 56521529. The reversal of 56521521 is 12512565.

56521521 is a `hidden beast` number, since 5 + 652 + 1 + 5 + 2 + 1 = 666.

It is not a de Polignac number, because 56521521 - 2⁹ = 56521009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56521529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29241 + ... + 31113.

It is an arithmetic number, because the mean of its divisors is an integer number (3897920).

Almost surely, 2^56521521 is an apocalyptic number.

It is an amenable number.

56521521 is a deficient number, since it is larger than the sum of its proper divisors (37028559).

56521521 is a wasteful number, since it uses less digits than its factorization.

56521521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2365 (or 2362 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 56521521 is about 7518.0796085171. The cubic root of 56521521 is about 383.7702279371.

The spelling of 56521521 in words is "fifty-six million, five hundred twenty-one thousand, five hundred twenty-one".