56861569 has 2 divisors, whose sum is σ = 56861570. Its totient is φ = 56861568.

The previous prime is 56861551. The next prime is 56861573. The reversal of 56861569 is 96516865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38688400 + 18173169 = 6220^2 + 4263^2 .

It is a cyclic number.

It is not a de Polignac number, because 56861569 - 2²³ = 48472961 is a prime.

It is a super-2 number, since 2×56861569² = 6466476058283522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56861579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28430784 + 28430785.

It is an arithmetic number, because the mean of its divisors is an integer number (28430785).

Almost surely, 2^56861569 is an apocalyptic number.

It is an amenable number.

56861569 is a deficient number, since it is larger than the sum of its proper divisors (1).

56861569 is an equidigital number, since it uses as much as digits as its factorization.

56861569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 46.

The square root of 56861569 is about 7540.6610452930. The cubic root of 56861569 is about 384.5383097792.

The spelling of 56861569 in words is "fifty-six million, eight hundred sixty-one thousand, five hundred sixty-nine".