991434632 has 16 divisors (see below), whose sum is σ = 1860149760. Its totient is φ = 495394704.

The previous prime is 991434601. The next prime is 991434641. The reversal of 991434632 is 236434199.

It is a self number, because there is not a number n which added to its sum of digits gives 991434632.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27008 + ... + 52079.

It is an arithmetic number, because the mean of its divisors is an integer number (116259360).

Almost surely, 2^991434632 is an apocalyptic number.

It is an amenable number.

991434632 is a deficient number, since it is larger than the sum of its proper divisors (868715128).

991434632 is a wasteful number, since it uses less digits than its factorization.

991434632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80660 (or 80656 counting only the distinct ones).

The product of its digits is 139968, while the sum is 41.

The square root of 991434632 is about 31487.0549909006. The cubic root of 991434632 is about 997.1366865947.

The spelling of 991434632 in words is "nine hundred ninety-one million, four hundred thirty-four thousand, six hundred thirty-two".