315085521 has 4 divisors (see below), whose sum is σ = 420114032. Its totient is φ = 210057012.

The previous prime is 315085517. The next prime is 315085541. The reversal of 315085521 is 125580513.

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 315085521 - 2² = 315085517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315085501) 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, 52514251 + ... + 52514256.

It is an arithmetic number, because the mean of its divisors is an integer number (105028508).

Almost surely, 2^315085521 is an apocalyptic number.

It is an amenable number.

315085521 is a deficient number, since it is larger than the sum of its proper divisors (105028511).

315085521 is a wasteful number, since it uses less digits than its factorization.

315085521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105028510.

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 315085521 is about 17750.6484670279. The cubic root of 315085521 is about 680.4707819773.

The spelling of 315085521 in words is "three hundred fifteen million, eighty-five thousand, five hundred twenty-one".