991975930924 has 24 divisors (see below), whose sum is σ = 1893834922896. Its totient is φ = 450883224000.

The previous prime is 991975930921. The next prime is 991975930931. The reversal of 991975930924 is 429039579199.

It is a self number, because there is not a number n which added to its sum of digits gives 991975930924.

It is not an unprimeable number, because it can be changed into a prime (991975930921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1030414 + ... + 1745194.

It is an arithmetic number, because the mean of its divisors is an integer number (78909788454).

Almost surely, 2^991975930924 is an apocalyptic number.

It is an amenable number.

991975930924 is a deficient number, since it is larger than the sum of its proper divisors (901858991972).

991975930924 is a wasteful number, since it uses less digits than its factorization.

991975930924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746337 (or 746335 counting only the distinct ones).

The product of its (nonzero) digits is 49601160, while the sum is 67.

The spelling of 991975930924 in words is "nine hundred ninety-one billion, nine hundred seventy-five million, nine hundred thirty thousand, nine hundred twenty-four".