315212521 has 8 divisors (see below), whose sum is σ = 359428104. Its totient is φ = 273849600.

The previous prime is 315212519. The next prime is 315212537. The reversal of 315212521 is 125212513.

It can be written as a sum of positive squares in 4 ways, for example, as 116402521 + 198810000 = 10789^2 + 14100^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 315212521 - 2¹ = 315212519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315212492 and 315212501.

It is not an unprimeable number, because it can be changed into a prime (315212561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712930 + ... + 713371.

It is an arithmetic number, because the mean of its divisors is an integer number (44928513).

Almost surely, 2^315212521 is an apocalyptic number.

It is an amenable number.

315212521 is a deficient number, since it is larger than the sum of its proper divisors (44215583).

315212521 is a wasteful number, since it uses less digits than its factorization.

315212521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426331.

The product of its digits is 600, while the sum is 22.

The square root of 315212521 is about 17754.2254407226. The cubic root of 315212521 is about 680.5621943878.

The spelling of 315212521 in words is "three hundred fifteen million, two hundred twelve thousand, five hundred twenty-one".