56557117 has 2 divisors, whose sum is σ = 56557118. Its totient is φ = 56557116.

The previous prime is 56557093. The next prime is 56557139. The reversal of 56557117 is 71175565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49406841 + 7150276 = 7029^2 + 2674^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56557117 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 (56557177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28278558 + 28278559.

It is an arithmetic number, because the mean of its divisors is an integer number (28278559).

Almost surely, 2^56557117 is an apocalyptic number.

It is an amenable number.

56557117 is a deficient number, since it is larger than the sum of its proper divisors (1).

56557117 is an equidigital number, since it uses as much as digits as its factorization.

56557117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36750, while the sum is 37.

The square root of 56557117 is about 7520.4465957814. The cubic root of 56557117 is about 383.8507743559.

The spelling of 56557117 in words is "fifty-six million, five hundred fifty-seven thousand, one hundred seventeen".