91118199 has 4 divisors (see below), whose sum is σ = 121490936. Its totient is φ = 60745464.

The previous prime is 91118197. The next prime is 91118219. The reversal of 91118199 is 99181119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99181119 = 3 ⋅33060373.

It is not a de Polignac number, because 91118199 - 2¹ = 91118197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91118197) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15186364 + ... + 15186369.

It is an arithmetic number, because the mean of its divisors is an integer number (30372734).

Almost surely, 2^91118199 is an apocalyptic number.

91118199 is a deficient number, since it is larger than the sum of its proper divisors (30372737).

91118199 is a wasteful number, since it uses less digits than its factorization.

91118199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30372736.

The product of its digits is 5832, while the sum is 39.

The square root of 91118199 is about 9545.5853146887. The cubic root of 91118199 is about 449.9888046598.

It can be divided in two parts, 911 and 18199, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 91118199 in words is "ninety-one million, one hundred eighteen thousand, one hundred ninety-nine".