991937892122 has 32 divisors (see below), whose sum is σ = 1523177825472. Its totient is φ = 484354151424.

The previous prime is 991937892109. The next prime is 991937892157. The reversal of 991937892122 is 221298739199.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9266618 + ... + 9373050.

It is an arithmetic number, because the mean of its divisors is an integer number (47599307046).

Almost surely, 2^991937892122 is an apocalyptic number.

991937892122 is a deficient number, since it is larger than the sum of its proper divisors (531239933350).

991937892122 is a wasteful number, since it uses less digits than its factorization.

991937892122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107102.

The product of its digits is 8817984, while the sum is 62.

The spelling of 991937892122 in words is "nine hundred ninety-one billion, nine hundred thirty-seven million, eight hundred ninety-two thousand, one hundred twenty-two".