216931914 has 24 divisors (see below), whose sum is σ = 471364452. Its totient is φ = 72103680.

The previous prime is 216931903. The next prime is 216931933. The reversal of 216931914 is 419139612.

It is a happy number.

216931914 is nontrivially palindromic in base 5.

It can be written as a sum of positive squares in 2 ways, for example, as 216531225 + 400689 = 14715^2 + 633^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10717 + ... + 23424.

Almost surely, 2^216931914 is an apocalyptic number.

216931914 is an abundant number, since it is smaller than the sum of its proper divisors (254432538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216931914 is a wasteful number, since it uses less digits than its factorization.

216931914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34502 (or 34499 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 216931914 is about 14728.6086919301. The cubic root of 216931914 is about 600.8616453531.

The spelling of 216931914 in words is "two hundred sixteen million, nine hundred thirty-one thousand, nine hundred fourteen".