991330232 has 16 divisors (see below), whose sum is σ = 1893815640. Its totient is φ = 486312736.

The previous prime is 991330211. The next prime is 991330243. The reversal of 991330232 is 232033199.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1168598 + ... + 1169445.

Almost surely, 2^991330232 is an apocalyptic number.

It is an amenable number.

991330232 is a deficient number, since it is larger than the sum of its proper divisors (902485408).

991330232 is a wasteful number, since it uses less digits than its factorization.

991330232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338102 (or 2338098 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 991330232 is about 31485.3971231109. The cubic root of 991330232 is about 997.1016852203.

It can be divided in two parts, 99 and 1330232, that added together give a palindrome (1330331).

The spelling of 991330232 in words is "nine hundred ninety-one million, three hundred thirty thousand, two hundred thirty-two".