318012257 has 2 divisors, whose sum is σ = 318012258. Its totient is φ = 318012256.

The previous prime is 318012223. The next prime is 318012281. The reversal of 318012257 is 752210813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276590161 + 41422096 = 16631^2 + 6436^2 .

It is a cyclic number.

It is not a de Polignac number, because 318012257 - 2⁸ = 318012001 is a prime.

It is a super-2 number, since 2×318012257² = 202263591204468098, which contains 22 as substring.

It is a Chen prime.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159006128 + 159006129.

It is an arithmetic number, because the mean of its divisors is an integer number (159006129).

Almost surely, 2^318012257 is an apocalyptic number.

It is an amenable number.

318012257 is a deficient number, since it is larger than the sum of its proper divisors (1).

318012257 is an equidigital number, since it uses as much as digits as its factorization.

318012257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 318012257 is about 17832.8981660301. The cubic root of 318012257 is about 682.5711891107.

The spelling of 318012257 in words is "three hundred eighteen million, twelve thousand, two hundred fifty-seven".