215512315 has 16 divisors (see below), whose sum is σ = 274344192. Its totient is φ = 161961984.

The previous prime is 215512303. The next prime is 215512321. The reversal of 215512315 is 513215512.

It is a cyclic number.

It is not a de Polignac number, because 215512315 - 2²⁵ = 181957883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215512315.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49507 + ... + 53683.

It is an arithmetic number, because the mean of its divisors is an integer number (17146512).

Almost surely, 2^215512315 is an apocalyptic number.

215512315 is a deficient number, since it is larger than the sum of its proper divisors (58831877).

215512315 is a wasteful number, since it uses less digits than its factorization.

215512315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4806.

The product of its digits is 1500, while the sum is 25.

The square root of 215512315 is about 14680.3377004754. The cubic root of 215512315 is about 599.5480995436.

Adding to 215512315 its reverse (513215512), we get a palindrome (728727827).

The spelling of 215512315 in words is "two hundred fifteen million, five hundred twelve thousand, three hundred fifteen".