56909917 has 2 divisors, whose sum is σ = 56909918. Its totient is φ = 56909916.

The previous prime is 56909899. The next prime is 56909929. The reversal of 56909917 is 71990965.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36650916 + 20259001 = 6054^2 + 4501^2 .

It is a cyclic number.

It is not a de Polignac number, because 56909917 - 2⁷ = 56909789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56909947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28454958 + 28454959.

It is an arithmetic number, because the mean of its divisors is an integer number (28454959).

Almost surely, 2^56909917 is an apocalyptic number.

It is an amenable number.

56909917 is a deficient number, since it is larger than the sum of its proper divisors (1).

56909917 is an equidigital number, since it uses as much as digits as its factorization.

56909917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 56909917 is about 7543.8661838609. The cubic root of 56909917 is about 384.6472667407.

The spelling of 56909917 in words is "fifty-six million, nine hundred nine thousand, nine hundred seventeen".