215312515 has 32 divisors (see below), whose sum is σ = 292626432. Its totient is φ = 150672000.

The previous prime is 215312491. The next prime is 215312519. The reversal of 215312515 is 515213512.

It is not a de Polignac number, because 215312515 - 2⁵ = 215312483 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 215312515.

It is not an unprimeable number, because it can be changed into a prime (215312519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 499350 + ... + 499780.

It is an arithmetic number, because the mean of its divisors is an integer number (9144576).

Almost surely, 2^215312515 is an apocalyptic number.

215312515 is a deficient number, since it is larger than the sum of its proper divisors (77313917).

215312515 is a wasteful number, since it uses less digits than its factorization.

215312515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771.

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

The square root of 215312515 is about 14673.5311019536. The cubic root of 215312515 is about 599.3627632700.

The spelling of 215312515 in words is "two hundred fifteen million, three hundred twelve thousand, five hundred fifteen".