215561315 has 8 divisors (see below), whose sum is σ = 258813360. Its totient is φ = 172355872.

The previous prime is 215561303. The next prime is 215561323. The reversal of 215561315 is 513165512.

215561315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 215561315 - 2⁴ = 215561299 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500 + ... + 20769.

It is an arithmetic number, because the mean of its divisors is an integer number (32351670).

Almost surely, 2^215561315 is an apocalyptic number.

215561315 is a deficient number, since it is larger than the sum of its proper divisors (43252045).

215561315 is a wasteful number, since it uses less digits than its factorization.

215561315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23301.

The product of its digits is 4500, while the sum is 29.

The square root of 215561315 is about 14682.0065045620. The cubic root of 215561315 is about 599.5935348909.

The spelling of 215561315 in words is "two hundred fifteen million, five hundred sixty-one thousand, three hundred fifteen".