99311191 has 16 divisors (see below), whose sum is σ = 116704000. Its totient is φ = 84470904.

The previous prime is 99311189. The next prime is 99311203. The reversal of 99311191 is 19111399.

It is not a de Polignac number, because 99311191 - 2¹ = 99311189 is a prime.

It is the 9966-th Hogben number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99311131) by changing a digit.

It is a nontrivial repunit in base 9965.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46636 + ... + 48718.

It is an arithmetic number, because the mean of its divisors is an integer number (7294000).

Almost surely, 2^99311191 is an apocalyptic number.

99311191 is a deficient number, since it is larger than the sum of its proper divisors (17392809).

99311191 is a wasteful number, since it uses less digits than its factorization.

99311191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243 (or 2229 counting only the distinct ones).

The product of its digits is 2187, while the sum is 34.

The square root of 99311191 is about 9965.5000376298. The cubic root of 99311191 is about 463.0907043020.

The spelling of 99311191 in words is "ninety-nine million, three hundred eleven thousand, one hundred ninety-one".