56672521 has 2 divisors, whose sum is σ = 56672522. Its totient is φ = 56672520.

The previous prime is 56672513. The next prime is 56672527. The reversal of 56672521 is 12527665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39200121 + 17472400 = 6261^2 + 4180^2 .

It is a cyclic number.

It is not a de Polignac number, because 56672521 - 2³ = 56672513 is a prime.

It is not a weakly prime, because it can be changed into another prime (56672527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28336260 + 28336261.

It is an arithmetic number, because the mean of its divisors is an integer number (28336261).

Almost surely, 2^56672521 is an apocalyptic number.

It is an amenable number.

56672521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56672521 is an equidigital number, since it uses as much as digits as its factorization.

56672521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 56672521 is about 7528.1153684040. The cubic root of 56672521 is about 384.1116776778. Note that the first 3 decimals are identical.

The spelling of 56672521 in words is "fifty-six million, six hundred seventy-two thousand, five hundred twenty-one".