315991212 has 12 divisors (see below), whose sum is σ = 737312856. Its totient is φ = 105330400.

The previous prime is 315991201. The next prime is 315991217. The reversal of 315991212 is 212199513.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×315991212² = 199700892122457888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (315991217) 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, 13166289 + ... + 13166312.

It is an arithmetic number, because the mean of its divisors is an integer number (61442738).

Almost surely, 2^315991212 is an apocalyptic number.

It is an amenable number.

315991212 is an abundant number, since it is smaller than the sum of its proper divisors (421321644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

315991212 is a wasteful number, since it uses less digits than its factorization.

315991212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26332608 (or 26332606 counting only the distinct ones).

The product of its digits is 4860, while the sum is 33.

The square root of 315991212 is about 17776.1416511008. The cubic root of 315991212 is about 681.1221466208.

The spelling of 315991212 in words is "three hundred fifteen million, nine hundred ninety-one thousand, two hundred twelve".