315565209 has 12 divisors (see below), whose sum is σ = 456751152. Its totient is φ = 209945400.

The previous prime is 315565207. The next prime is 315565231. The reversal of 315565209 is 902565513.

It is not a de Polignac number, because 315565209 - 2¹ = 315565207 is a prime.

It is a super-2 number, since 2×315565209² = 199162802262427362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (315565207) 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, 31287 + ... + 40124.

It is an arithmetic number, because the mean of its divisors is an integer number (38062596).

Almost surely, 2^315565209 is an apocalyptic number.

It is an amenable number.

315565209 is a deficient number, since it is larger than the sum of its proper divisors (141185943).

315565209 is a wasteful number, since it uses less digits than its factorization.

315565209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71908 (or 71905 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The square root of 315565209 is about 17764.1551727066. The cubic root of 315565209 is about 680.8159244249.

The spelling of 315565209 in words is "three hundred fifteen million, five hundred sixty-five thousand, two hundred nine".