56161557 has 12 divisors (see below), whose sum is σ = 85894380. Its totient is φ = 35238528.

The previous prime is 56161543. The next prime is 56161577. The reversal of 56161557 is 75516165.

It can be written as a sum of positive squares in 2 ways, for example, as 43480836 + 12680721 = 6594^2 + 3561^2 .

It is not a de Polignac number, because 56161557 - 2⁶ = 56161493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56161507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183382 + ... + 183687.

It is an arithmetic number, because the mean of its divisors is an integer number (7157865).

Almost surely, 2^56161557 is an apocalyptic number.

It is an amenable number.

56161557 is a deficient number, since it is larger than the sum of its proper divisors (29732823).

56161557 is a wasteful number, since it uses less digits than its factorization.

56161557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367092 (or 367089 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 56161557 is about 7494.1014804978. The cubic root of 56161557 is about 382.9537969157.

The spelling of 56161557 in words is "fifty-six million, one hundred sixty-one thousand, five hundred fifty-seven".