215305215 has 16 divisors (see below), whose sum is σ = 344716800. Its totient is φ = 114753312.

The previous prime is 215305163. The next prime is 215305229. The reversal of 215305215 is 512503512.

It is a happy number.

It is not a de Polignac number, because 215305215 - 2⁷ = 215305087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24366 + ... + 32004.

It is an arithmetic number, because the mean of its divisors is an integer number (21544800).

Almost surely, 2^215305215 is an apocalyptic number.

215305215 is a deficient number, since it is larger than the sum of its proper divisors (129411585).

215305215 is a wasteful number, since it uses less digits than its factorization.

215305215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9526.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 215305215 is about 14673.2823526299. The cubic root of 215305215 is about 599.3559895538.

Adding to 215305215 its reverse (512503512), we get a palindrome (727808727).

The spelling of 215305215 in words is "two hundred fifteen million, three hundred five thousand, two hundred fifteen".