311120857 has 2 divisors, whose sum is σ = 311120858. Its totient is φ = 311120856.

The previous prime is 311120837. The next prime is 311120863. The reversal of 311120857 is 758021113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226683136 + 84437721 = 15056^2 + 9189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311120857 is a prime.

It is not a weakly prime, because it can be changed into another prime (311120837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155560428 + 155560429.

It is an arithmetic number, because the mean of its divisors is an integer number (155560429).

Almost surely, 2^311120857 is an apocalyptic number.

It is an amenable number.

311120857 is a deficient number, since it is larger than the sum of its proper divisors (1).

311120857 is an equidigital number, since it uses as much as digits as its factorization.

311120857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 311120857 is about 17638.6183415822. The cubic root of 311120857 is about 677.6046466260.

It can be divided in two parts, 3111208 and 57, that added together give a triangular number (3111265 = T₂₄₉₄).

The spelling of 311120857 in words is "three hundred eleven million, one hundred twenty thousand, eight hundred fifty-seven".