56916817 has 2 divisors, whose sum is σ = 56916818. Its totient is φ = 56916816.

The previous prime is 56916757. The next prime is 56916823. The reversal of 56916817 is 71861965.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40908816 + 16008001 = 6396^2 + 4001^2 .

It is a cyclic number.

It is not a de Polignac number, because 56916817 - 2⁷ = 56916689 is a prime.

It is a super-2 number, since 2×56916817² = 6479048114822978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56916877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28458408 + 28458409.

It is an arithmetic number, because the mean of its divisors is an integer number (28458409).

Almost surely, 2^56916817 is an apocalyptic number.

It is an amenable number.

56916817 is a deficient number, since it is larger than the sum of its proper divisors (1).

56916817 is an equidigital number, since it uses as much as digits as its factorization.

56916817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 56916817 is about 7544.3234951850. The cubic root of 56916817 is about 384.6628115351.

The spelling of 56916817 in words is "fifty-six million, nine hundred sixteen thousand, eight hundred seventeen".