56520557 has 2 divisors, whose sum is σ = 56520558. Its totient is φ = 56520556.

The previous prime is 56520553. The next prime is 56520589. The reversal of 56520557 is 75502565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55562116 + 958441 = 7454^2 + 979^2 .

It is a cyclic number.

It is not a de Polignac number, because 56520557 - 2² = 56520553 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56520551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28260278 + 28260279.

It is an arithmetic number, because the mean of its divisors is an integer number (28260279).

Almost surely, 2^56520557 is an apocalyptic number.

It is an amenable number.

56520557 is a deficient number, since it is larger than the sum of its proper divisors (1).

56520557 is an equidigital number, since it uses as much as digits as its factorization.

56520557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52500, while the sum is 35.

The square root of 56520557 is about 7518.0154961266. The cubic root of 56520557 is about 383.7680461333.

The spelling of 56520557 in words is "fifty-six million, five hundred twenty thousand, five hundred fifty-seven".