991311204 has 24 divisors (see below), whose sum is σ = 2490987520. Its totient is φ = 305018784.

The previous prime is 991311199. The next prime is 991311227. The reversal of 991311204 is 402113199.

991311204 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 3177124 + ... + 3177435.

Almost surely, 2^991311204 is an apocalyptic number.

It is an amenable number.

991311204 is an abundant number, since it is smaller than the sum of its proper divisors (1499676316).

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

991311204 is a wasteful number, since it uses less digits than its factorization.

991311204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6354579 (or 6354577 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 991311204 is about 31485.0949498330. The cubic root of 991311204 is about 997.0953055862.

The spelling of 991311204 in words is "nine hundred ninety-one million, three hundred eleven thousand, two hundred four".