991118372 has 24 divisors (see below), whose sum is σ = 1770938400. Its totient is φ = 485234496.

The previous prime is 991118357. The next prime is 991118407. The reversal of 991118372 is 273811199.

It is a happy number.

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, 28379 + ... + 52797.

It is an arithmetic number, because the mean of its divisors is an integer number (73789100).

Almost surely, 2^991118372 is an apocalyptic number.

It is an amenable number.

991118372 is a deficient number, since it is larger than the sum of its proper divisors (779820028).

991118372 is a wasteful number, since it uses less digits than its factorization.

991118372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24635 (or 24633 counting only the distinct ones).

The product of its digits is 27216, while the sum is 41.

The square root of 991118372 is about 31482.0325265063. The cubic root of 991118372 is about 997.0306490150.

The spelling of 991118372 in words is "nine hundred ninety-one million, one hundred eighteen thousand, three hundred seventy-two".