9108991 has 12 divisors (see below), whose sum is σ = 9914872. Its totient is φ = 8362368.

The previous prime is 9108977. The next prime is 9109019. The reversal of 9108991 is 1998019.

It is not a de Polignac number, because 9108991 - 2¹¹ = 9106943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9108991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9108901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12061 + ... + 12793.

Almost surely, 2^9108991 is an apocalyptic number.

9108991 is a deficient number, since it is larger than the sum of its proper divisors (805881).

9108991 is a wasteful number, since it uses less digits than its factorization.

9108991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 793 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 9108991 is about 3018.1105016218. The cubic root of 9108991 is about 208.8446836422.

The spelling of 9108991 in words is "nine million, one hundred eight thousand, nine hundred ninety-one".