56117561 has 8 divisors (see below), whose sum is σ = 60868584. Its totient is φ = 51527680.

The previous prime is 56117549. The next prime is 56117563. The reversal of 56117561 is 16571165.

It can be written as a sum of positive squares in 4 ways, for example, as 525625 + 55591936 = 725^2 + 7456^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-56117561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56117563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39560 + ... + 40953.

It is an arithmetic number, because the mean of its divisors is an integer number (7608573).

Almost surely, 2^56117561 is an apocalyptic number.

It is an amenable number.

56117561 is a deficient number, since it is larger than the sum of its proper divisors (4751023).

56117561 is a wasteful number, since it uses less digits than its factorization.

56117561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80571.

The product of its digits is 6300, while the sum is 32.

The square root of 56117561 is about 7491.1655301428. The cubic root of 56117561 is about 382.8537709807.

The spelling of 56117561 in words is "fifty-six million, one hundred seventeen thousand, five hundred sixty-one".