991328504524 has 12 divisors (see below), whose sum is σ = 1775169647944. Its totient is φ = 484137176544.

The previous prime is 991328504477. The next prime is 991328504587. The reversal of 991328504524 is 425405823199.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2881768737 + ... + 2881769080.

Almost surely, 2^991328504524 is an apocalyptic number.

It is an amenable number.

991328504524 is a deficient number, since it is larger than the sum of its proper divisors (783841143420).

991328504524 is a wasteful number, since it uses less digits than its factorization.

991328504524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5763537864 (or 5763537862 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 991328504524 in words is "nine hundred ninety-one billion, three hundred twenty-eight million, five hundred four thousand, five hundred twenty-four".