991012310304 has 48 divisors (see below), whose sum is σ = 2640234306528. Its totient is φ = 325407025152.

The previous prime is 991012310297. The next prime is 991012310329. The reversal of 991012310304 is 403013210199.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77031217 + ... + 77044080.

It is an arithmetic number, because the mean of its divisors is an integer number (55004881386).

Almost surely, 2^991012310304 is an apocalyptic number.

It is an amenable number.

991012310304 is an abundant number, since it is smaller than the sum of its proper divisors (1649221996224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991012310304 is a wasteful number, since it uses less digits than its factorization.

991012310304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154075377 (or 154075369 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The spelling of 991012310304 in words is "nine hundred ninety-one billion, twelve million, three hundred ten thousand, three hundred four".