191116812 has 24 divisors (see below), whose sum is σ = 453499200. Its totient is φ = 62625616.

The previous prime is 191116789. The next prime is 191116823. The reversal of 191116812 is 218611191.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 191116812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134262 + ... + 135677.

It is an arithmetic number, because the mean of its divisors is an integer number (18895800).

Almost surely, 2^191116812 is an apocalyptic number.

191116812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

191116812 is an abundant number, since it is smaller than the sum of its proper divisors (262382388).

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

191116812 is a wasteful number, since it uses less digits than its factorization.

191116812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270005 (or 270003 counting only the distinct ones).

The product of its digits is 864, while the sum is 30.

The square root of 191116812 is about 13824.5004249702. The cubic root of 191116812 is about 576.0139006097.

The spelling of 191116812 in words is "one hundred ninety-one million, one hundred sixteen thousand, eight hundred twelve".