91118198 has 16 divisors (see below), whose sum is σ = 148630464. Its totient is φ = 41719680.

The previous prime is 91118197. The next prime is 91118219. The reversal of 91118198 is 89181119.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34958 + ... + 37473.

It is an arithmetic number, because the mean of its divisors is an integer number (9289404).

Almost surely, 2^91118198 is an apocalyptic number.

91118198 is a deficient number, since it is larger than the sum of its proper divisors (57512266).

91118198 is a wasteful number, since it uses less digits than its factorization.

91118198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72487.

The product of its digits is 5184, while the sum is 38.

The square root of 91118198 is about 9545.5852623084. The cubic root of 91118198 is about 449.9888030136.

The spelling of 91118198 in words is "ninety-one million, one hundred eighteen thousand, one hundred ninety-eight".