56857 has 2 divisors, whose sum is σ = 56858. Its totient is φ = 56856.

The previous prime is 56843. The next prime is 56873. The reversal of 56857 is 75865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46656 + 10201 = 216^2 + 101^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56857 is a prime.

It is not a weakly prime, because it can be changed into another prime (56807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28428 + 28429.

It is an arithmetic number, because the mean of its divisors is an integer number (28429).

2⁵⁶⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

56857 is a deficient number, since it is larger than the sum of its proper divisors (1).

56857 is an equidigital number, since it uses as much as digits as its factorization.

56857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 56857 is about 238.4470591138. The cubic root of 56857 is about 38.4528009896.

It can be divided in two parts, 568 and 57, that added together give a 4-th power (625 = 5⁴).

The spelling of 56857 in words is "fifty-six thousand, eight hundred fifty-seven".