257318317 has 2 divisors, whose sum is σ = 257318318. Its totient is φ = 257318316.

The previous prime is 257318309. The next prime is 257318353. The reversal of 257318317 is 713813752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187662601 + 69655716 = 13699^2 + 8346^2 .

It is a cyclic number.

It is not a de Polignac number, because 257318317 - 2³ = 257318309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257318377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128659158 + 128659159.

It is an arithmetic number, because the mean of its divisors is an integer number (128659159).

Almost surely, 2^257318317 is an apocalyptic number.

It is an amenable number.

257318317 is a deficient number, since it is larger than the sum of its proper divisors (1).

257318317 is an equidigital number, since it uses as much as digits as its factorization.

257318317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 257318317 is about 16041.1445040558. The cubic root of 257318317 is about 636.0485019312.

The spelling of 257318317 in words is "two hundred fifty-seven million, three hundred eighteen thousand, three hundred seventeen".