56564021 has 2 divisors, whose sum is σ = 56564022. Its totient is φ = 56564020.

The previous prime is 56564017. The next prime is 56564033. The reversal of 56564021 is 12046565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53085796 + 3478225 = 7286^2 + 1865^2 .

It is a cyclic number.

It is not a de Polignac number, because 56564021 - 2² = 56564017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56564041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28282010 + 28282011.

It is an arithmetic number, because the mean of its divisors is an integer number (28282011).

Almost surely, 2^56564021 is an apocalyptic number.

It is an amenable number.

56564021 is a deficient number, since it is larger than the sum of its proper divisors (1).

56564021 is an equidigital number, since it uses as much as digits as its factorization.

56564021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 56564021 is about 7520.9055970674. The cubic root of 56564021 is about 383.8663927729.

The spelling of 56564021 in words is "fifty-six million, five hundred sixty-four thousand, twenty-one".