315180921 has 12 divisors (see below), whose sum is σ = 461918576. Its totient is φ = 191018520.

The previous prime is 315180917. The next prime is 315180953. The reversal of 315180921 is 129081513.

It is not a de Polignac number, because 315180921 - 2² = 315180917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315180991) 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, 433771 + ... + 434496.

Almost surely, 2^315180921 is an apocalyptic number.

It is an amenable number.

315180921 is a deficient number, since it is larger than the sum of its proper divisors (146737655).

315180921 is a wasteful number, since it uses less digits than its factorization.

315180921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868292 (or 868281 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 315180921 is about 17753.3354894228. The cubic root of 315180921 is about 680.5394515475.

The spelling of 315180921 in words is "three hundred fifteen million, one hundred eighty thousand, nine hundred twenty-one".