56955721 has 2 divisors, whose sum is σ = 56955722. Its totient is φ = 56955720.

The previous prime is 56955713. The next prime is 56955727. The reversal of 56955721 is 12755965.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55428025 + 1527696 = 7445^2 + 1236^2 .

It is a cyclic number.

It is not a de Polignac number, because 56955721 - 2³ = 56955713 is a prime.

It is not a weakly prime, because it can be changed into another prime (56955727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28477860 + 28477861.

It is an arithmetic number, because the mean of its divisors is an integer number (28477861).

Almost surely, 2^56955721 is an apocalyptic number.

It is an amenable number.

56955721 is a deficient number, since it is larger than the sum of its proper divisors (1).

56955721 is an equidigital number, since it uses as much as digits as its factorization.

56955721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94500, while the sum is 40.

The square root of 56955721 is about 7546.9014171380. The cubic root of 56955721 is about 384.7504336386.

The spelling of 56955721 in words is "fifty-six million, nine hundred fifty-five thousand, seven hundred twenty-one".