315947021 has 12 divisors (see below), whose sum is σ = 356999328. Its totient is φ = 278959824.

The previous prime is 315947017. The next prime is 315947087. The reversal of 315947021 is 120749513.

It is not a de Polignac number, because 315947021 - 2² = 315947017 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 (315947011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36755 + ... + 44528.

It is an arithmetic number, because the mean of its divisors is an integer number (29749944).

Almost surely, 2^315947021 is an apocalyptic number.

It is an amenable number.

315947021 is a deficient number, since it is larger than the sum of its proper divisors (41052307).

315947021 is a wasteful number, since it uses less digits than its factorization.

315947021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81332 (or 81319 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 315947021 is about 17774.8986213705. The cubic root of 315947021 is about 681.0903937631.

The spelling of 315947021 in words is "three hundred fifteen million, nine hundred forty-seven thousand, twenty-one".