991199932 has 48 divisors (see below), whose sum is σ = 1828985760. Its totient is φ = 469389312.

The previous prime is 991199917. The next prime is 991199947. The reversal of 991199932 is 239991199.

It is an interprime number because it is at equal distance from previous prime (991199917) and next prime (991199947).

It is a self number, because there is not a number n which added to its sum of digits gives 991199932.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1541203 + ... + 1541845.

It is an arithmetic number, because the mean of its divisors is an integer number (38103870).

Almost surely, 2^991199932 is an apocalyptic number.

It is an amenable number.

991199932 is a deficient number, since it is larger than the sum of its proper divisors (837785828).

991199932 is a wasteful number, since it uses less digits than its factorization.

991199932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 908 counting only the distinct ones).

The product of its digits is 354294, while the sum is 52.

The square root of 991199932 is about 31483.3278418912. The cubic root of 991199932 is about 997.0579971070.

The spelling of 991199932 in words is "nine hundred ninety-one million, one hundred ninety-nine thousand, nine hundred thirty-two".