56457217 has 2 divisors, whose sum is σ = 56457218. Its totient is φ = 56457216.

The previous prime is 56457211. The next prime is 56457241. The reversal of 56457217 is 71275465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48385936 + 8071281 = 6956^2 + 2841^2 .

It is a cyclic number.

It is not a de Polignac number, because 56457217 - 2²³ = 48068609 is a prime.

It is not a weakly prime, because it can be changed into another prime (56457211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28228608 + 28228609.

It is an arithmetic number, because the mean of its divisors is an integer number (28228609).

Almost surely, 2^56457217 is an apocalyptic number.

It is an amenable number.

56457217 is a deficient number, since it is larger than the sum of its proper divisors (1).

56457217 is an equidigital number, since it uses as much as digits as its factorization.

56457217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 37.

The square root of 56457217 is about 7513.8017674144. The cubic root of 56457217 is about 383.6246354568.

The spelling of 56457217 in words is "fifty-six million, four hundred fifty-seven thousand, two hundred seventeen".