56965721 has 2 divisors, whose sum is σ = 56965722. Its totient is φ = 56965720.

The previous prime is 56965709. The next prime is 56965747. The reversal of 56965721 is 12756965.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52722121 + 4243600 = 7261^2 + 2060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56965721 is a prime.

It is not a weakly prime, because it can be changed into another prime (56965751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28482860 + 28482861.

It is an arithmetic number, because the mean of its divisors is an integer number (28482861).

Almost surely, 2^56965721 is an apocalyptic number.

It is an amenable number.

56965721 is a deficient number, since it is larger than the sum of its proper divisors (1).

56965721 is an equidigital number, since it uses as much as digits as its factorization.

56965721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 41.

The square root of 56965721 is about 7547.5639116208. The cubic root of 56965721 is about 384.7729498384.

The spelling of 56965721 in words is "fifty-six million, nine hundred sixty-five thousand, seven hundred twenty-one".