56579821 has 2 divisors, whose sum is σ = 56579822. Its totient is φ = 56579820.

The previous prime is 56579807. The next prime is 56579843. The reversal of 56579821 is 12897565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46049796 + 10530025 = 6786^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 56579821 - 2²⁵ = 23025389 is a prime.

It is a super-2 number, since 2×56579821² = 6402552288784082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56579521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28289910 + 28289911.

It is an arithmetic number, because the mean of its divisors is an integer number (28289911).

Almost surely, 2^56579821 is an apocalyptic number.

It is an amenable number.

56579821 is a deficient number, since it is larger than the sum of its proper divisors (1).

56579821 is an equidigital number, since it uses as much as digits as its factorization.

56579821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 43.

The square root of 56579821 is about 7521.9559291450. The cubic root of 56579821 is about 383.9021311820.

The spelling of 56579821 in words is "fifty-six million, five hundred seventy-nine thousand, eight hundred twenty-one".