56716561 has 4 divisors (see below), whose sum is σ = 61872624. Its totient is φ = 51560500.

The previous prime is 56716553. The next prime is 56716567. The reversal of 56716561 is 16561765.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56716561 - 2³ = 56716553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56716561.

It is not an unprimeable number, because it can be changed into a prime (56716567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2578015 + ... + 2578036.

It is an arithmetic number, because the mean of its divisors is an integer number (15468156).

Almost surely, 2^56716561 is an apocalyptic number.

It is an amenable number.

56716561 is a deficient number, since it is larger than the sum of its proper divisors (5156063).

56716561 is a wasteful number, since it uses less digits than its factorization.

56716561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5156062.

The product of its digits is 37800, while the sum is 37.

The square root of 56716561 is about 7531.0398352419. The cubic root of 56716561 is about 384.2111491560.

It can be divided in two parts, 56 and 716561, that added together give a palindrome (716617).

The spelling of 56716561 in words is "fifty-six million, seven hundred sixteen thousand, five hundred sixty-one".