91123118 has 16 divisors (see below), whose sum is σ = 138168240. Its totient is φ = 45069696.

The previous prime is 91123099. The next prime is 91123121. The reversal of 91123118 is 81132119.

It is a congruent number.

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, 119996 + ... + 120752.

It is an arithmetic number, because the mean of its divisors is an integer number (8635515).

Almost surely, 2^91123118 is an apocalyptic number.

91123118 is a deficient number, since it is larger than the sum of its proper divisors (47045122).

91123118 is a wasteful number, since it uses less digits than its factorization.

91123118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331.

The product of its digits is 432, while the sum is 26.

The square root of 91123118 is about 9545.8429695863. The cubic root of 91123118 is about 449.9969020363.

Subtracting from 91123118 its reverse (81132119), we obtain a palindrome (9990999).

The spelling of 91123118 in words is "ninety-one million, one hundred twenty-three thousand, one hundred eighteen".