91116189 has 12 divisors (see below), whose sum is σ = 131903772. Its totient is φ = 60609600.

The previous prime is 91116187. The next prime is 91116197. The reversal of 91116189 is 98161119.

It can be written as a sum of positive squares in 2 ways, for example, as 51236964 + 39879225 = 7158^2 + 6315^2 .

It is not a de Polignac number, because 91116189 - 2¹ = 91116187 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91116187) 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, 6832 + ... + 15129.

It is an arithmetic number, because the mean of its divisors is an integer number (10991981).

Almost surely, 2^91116189 is an apocalyptic number.

It is an amenable number.

91116189 is a deficient number, since it is larger than the sum of its proper divisors (40787583).

91116189 is a wasteful number, since it uses less digits than its factorization.

91116189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22428 (or 22425 counting only the distinct ones).

The product of its digits is 3888, while the sum is 36.

The square root of 91116189 is about 9545.4800298361. The cubic root of 91116189 is about 449.9854958288.

The spelling of 91116189 in words is "ninety-one million, one hundred sixteen thousand, one hundred eighty-nine".