315857239 has 2 divisors, whose sum is σ = 315857240. Its totient is φ = 315857238.

The previous prime is 315857221. The next prime is 315857279. The reversal of 315857239 is 932758513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 315857239 - 2²⁵ = 282302807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 315857195 and 315857204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315857219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157928619 + 157928620.

It is an arithmetic number, because the mean of its divisors is an integer number (157928620).

Almost surely, 2^315857239 is an apocalyptic number.

315857239 is a deficient number, since it is larger than the sum of its proper divisors (1).

315857239 is an equidigital number, since it uses as much as digits as its factorization.

315857239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 43.

The square root of 315857239 is about 17772.3729141609. The cubic root of 315857239 is about 681.0258729765.

The spelling of 315857239 in words is "three hundred fifteen million, eight hundred fifty-seven thousand, two hundred thirty-nine".