216831315 has 16 divisors (see below), whose sum is σ = 348375456. Its totient is φ = 115161600.

The previous prime is 216831301. The next prime is 216831341. The reversal of 216831315 is 513138612.

It is not a de Polignac number, because 216831315 - 2⁴ = 216831299 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26376 + ... + 33605.

It is an arithmetic number, because the mean of its divisors is an integer number (21773466).

Almost surely, 2^216831315 is an apocalyptic number.

216831315 is a deficient number, since it is larger than the sum of its proper divisors (131544141).

216831315 is a wasteful number, since it uses less digits than its factorization.

216831315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60230.

The product of its digits is 4320, while the sum is 30.

The square root of 216831315 is about 14725.1932075610. The cubic root of 216831315 is about 600.7687507276.

Adding to 216831315 its reverse (513138612), we get a palindrome (729969927).

The spelling of 216831315 in words is "two hundred sixteen million, eight hundred thirty-one thousand, three hundred fifteen".