216931833 has 6 divisors (see below), whose sum is σ = 313345994. Its totient is φ = 144621216.

The previous prime is 216931829. The next prime is 216931859. The reversal of 216931833 is 338139612.

It can be written as a sum of positive squares in only one way, i.e., 158684409 + 58247424 = 12597^2 + 7632^2 .

It is not a de Polignac number, because 216931833 - 2² = 216931829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216931823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12051760 + ... + 12051777.

Almost surely, 2^216931833 is an apocalyptic number.

It is an amenable number.

216931833 is a deficient number, since it is larger than the sum of its proper divisors (96414161).

216931833 is a wasteful number, since it uses less digits than its factorization.

216931833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24103543 (or 24103540 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 216931833 is about 14728.6059421793. The cubic root of 216931833 is about 600.8615705681.

The spelling of 216931833 in words is "two hundred sixteen million, nine hundred thirty-one thousand, eight hundred thirty-three".