315904621 has 4 divisors (see below), whose sum is σ = 332531200. Its totient is φ = 299278044.

The previous prime is 315904613. The next prime is 315904639. The reversal of 315904621 is 126409513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 315904621 - 2³ = 315904613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315904651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8313261 + ... + 8313298.

It is an arithmetic number, because the mean of its divisors is an integer number (83132800).

Almost surely, 2^315904621 is an apocalyptic number.

It is an amenable number.

315904621 is a deficient number, since it is larger than the sum of its proper divisors (16626579).

315904621 is a wasteful number, since it uses less digits than its factorization.

315904621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16626578.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 315904621 is about 17773.7058881934. The cubic root of 315904621 is about 681.0599250213.

The spelling of 315904621 in words is "three hundred fifteen million, nine hundred four thousand, six hundred twenty-one".