315857313 has 20 divisors (see below), whose sum is σ = 472334148. Its totient is φ = 210349440.

The previous prime is 315857303. The next prime is 315857323. The reversal of 315857313 is 313758513.

It is a happy number.

315857313 is a `hidden beast` number, since 3 + 1 + 585 + 73 + 1 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (315857303) and next prime (315857323).

It can be written as a sum of positive squares in 2 ways, for example, as 90497169 + 225360144 = 9513^2 + 15012^2 .

It is not a de Polignac number, because 315857313 - 2¹⁴ = 315840929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (315857303) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 118645 + ... + 121277.

Almost surely, 2^315857313 is an apocalyptic number.

It is an amenable number.

315857313 is a deficient number, since it is larger than the sum of its proper divisors (156476835).

315857313 is a wasteful number, since it uses less digits than its factorization.

315857313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126 (or 4117 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 315857313 is about 17772.3749960437. The cubic root of 315857313 is about 681.0259261608.

The spelling of 315857313 in words is "three hundred fifteen million, eight hundred fifty-seven thousand, three hundred thirteen".