991108922 has 16 divisors (see below), whose sum is σ = 1493698752. Its totient is φ = 493215360.

The previous prime is 991108883. The next prime is 991108961. The reversal of 991108922 is 229801199.

It is an interprime number because it is at equal distance from previous prime (991108883) and next prime (991108961).

It is a self number, because there is not a number n which added to its sum of digits gives 991108922.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512297 + ... + 514227.

It is an arithmetic number, because the mean of its divisors is an integer number (93356172).

Almost surely, 2^991108922 is an apocalyptic number.

991108922 is a deficient number, since it is larger than the sum of its proper divisors (502589830).

991108922 is a wasteful number, since it uses less digits than its factorization.

991108922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3013.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 991108922 is about 31481.8824405403. The cubic root of 991108922 is about 997.0274802144.

The spelling of 991108922 in words is "nine hundred ninety-one million, one hundred eight thousand, nine hundred twenty-two".