56621573 has 2 divisors, whose sum is σ = 56621574. Its totient is φ = 56621572.

The previous prime is 56621557. The next prime is 56621623. The reversal of 56621573 is 37512665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50154724 + 6466849 = 7082^2 + 2543^2 .

It is a cyclic number.

It is not a de Polignac number, because 56621573 - 2⁴ = 56621557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56620573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28310786 + 28310787.

It is an arithmetic number, because the mean of its divisors is an integer number (28310787).

Almost surely, 2^56621573 is an apocalyptic number.

It is an amenable number.

56621573 is a deficient number, since it is larger than the sum of its proper divisors (1).

56621573 is an equidigital number, since it uses as much as digits as its factorization.

56621573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 35.

The square root of 56621573 is about 7524.7307593030. The cubic root of 56621573 is about 383.9965390494.

The spelling of 56621573 in words is "fifty-six million, six hundred twenty-one thousand, five hundred seventy-three".