991223312232 has 16 divisors (see below), whose sum is σ = 2478058280640. Its totient is φ = 330407770736.

The previous prime is 991223312221. The next prime is 991223312311. The reversal of 991223312232 is 232213322199.

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, 20650485648 + ... + 20650485695.

It is an arithmetic number, because the mean of its divisors is an integer number (154878642540).

Almost surely, 2^991223312232 is an apocalyptic number.

It is an amenable number.

991223312232 is an abundant number, since it is smaller than the sum of its proper divisors (1486834968408).

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

991223312232 is a wasteful number, since it uses less digits than its factorization.

991223312232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41300971352 (or 41300971348 counting only the distinct ones).

The product of its digits is 69984, while the sum is 39.

The spelling of 991223312232 in words is "nine hundred ninety-one billion, two hundred twenty-three million, three hundred twelve thousand, two hundred thirty-two".