91138108 has 12 divisors (see below), whose sum is σ = 161040880. Its totient is φ = 45126432.

The previous prime is 91138049. The next prime is 91138127. The reversal of 91138108 is 80183119.

It is a self number, because there is not a number n which added to its sum of digits gives 91138108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110193 + ... + 111016.

Almost surely, 2^91138108 is an apocalyptic number.

It is an amenable number.

91138108 is a deficient number, since it is larger than the sum of its proper divisors (69902772).

91138108 is a wasteful number, since it uses less digits than its factorization.

91138108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221316 (or 221314 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 91138108 is about 9546.6280958252. The cubic root of 91138108 is about 450.0215759202.

The spelling of 91138108 in words is "ninety-one million, one hundred thirty-eight thousand, one hundred eight".