216597085 has 16 divisors (see below), whose sum is σ = 284698800. Its totient is φ = 157459456.

The previous prime is 216597071. The next prime is 216597097. The reversal of 216597085 is 580795612.

It can be written as a sum of positive squares in 8 ways, for example, as 8631844 + 207965241 = 2938^2 + 14421^2 .

It is a cyclic number.

It is not a de Polignac number, because 216597085 - 2⁹ = 216596573 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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41470 + ... + 46399.

It is an arithmetic number, because the mean of its divisors is an integer number (17793675).

Almost surely, 2^216597085 is an apocalyptic number.

It is an amenable number.

216597085 is a deficient number, since it is larger than the sum of its proper divisors (68101715).

216597085 is a wasteful number, since it uses less digits than its factorization.

216597085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87920.

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 216597085 is about 14717.2376823914. The cubic root of 216597085 is about 600.5523478452.

The spelling of 216597085 in words is "two hundred sixteen million, five hundred ninety-seven thousand, eighty-five".