315817979 has 2 divisors, whose sum is σ = 315817980. Its totient is φ = 315817978.

The previous prime is 315817969. The next prime is 315818003. The reversal of 315817979 is 979718513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 315817979 - 2⁴ = 315817963 is a prime.

It is not a weakly prime, because it can be changed into another prime (315817969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157908989 + 157908990.

It is an arithmetic number, because the mean of its divisors is an integer number (157908990).

Almost surely, 2^315817979 is an apocalyptic number.

315817979 is a deficient number, since it is larger than the sum of its proper divisors (1).

315817979 is an equidigital number, since it uses as much as digits as its factorization.

315817979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 50.

The square root of 315817979 is about 17771.2683565355. The cubic root of 315817979 is about 680.9976553935.

The spelling of 315817979 in words is "three hundred fifteen million, eight hundred seventeen thousand, nine hundred seventy-nine".