215164985 has 16 divisors (see below), whose sum is σ = 295470336. Its totient is φ = 147348288.

The previous prime is 215164979. The next prime is 215164997. The reversal of 215164985 is 589461512.

It is a cyclic number.

It is not a de Polignac number, because 215164985 - 2⁶ = 215164921 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 26252 + ... + 33458.

It is an arithmetic number, because the mean of its divisors is an integer number (18466896).

Almost surely, 2^215164985 is an apocalyptic number.

It is an amenable number.

215164985 is a deficient number, since it is larger than the sum of its proper divisors (80305351).

215164985 is an equidigital number, since it uses as much as digits as its factorization.

215164985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8072.

The product of its digits is 86400, while the sum is 41.

The square root of 215164985 is about 14668.5031615363. The cubic root of 215164985 is about 599.2258395185.

The spelling of 215164985 in words is "two hundred fifteen million, one hundred sixty-four thousand, nine hundred eighty-five".