56857217 has 2 divisors, whose sum is σ = 56857218. Its totient is φ = 56857216.

The previous prime is 56857189. The next prime is 56857261. The reversal of 56857217 is 71275865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50751376 + 6105841 = 7124^2 + 2471^2 .

It is a cyclic number.

It is not a de Polignac number, because 56857217 - 2⁶ = 56857153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56857117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28428608 + 28428609.

It is an arithmetic number, because the mean of its divisors is an integer number (28428609).

Almost surely, 2^56857217 is an apocalyptic number.

It is an amenable number.

56857217 is a deficient number, since it is larger than the sum of its proper divisors (1).

56857217 is an equidigital number, since it uses as much as digits as its factorization.

56857217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 41.

The square root of 56857217 is about 7540.3724709062. The cubic root of 56857217 is about 384.5284990908.

The spelling of 56857217 in words is "fifty-six million, eight hundred fifty-seven thousand, two hundred seventeen".