91081116 has 36 divisors (see below), whose sum is σ = 263123952. Its totient is φ = 26023104.

The previous prime is 91081099. The next prime is 91081147. The reversal of 91081116 is 61118019.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 91081116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180465 + ... + 180968.

Almost surely, 2^91081116 is an apocalyptic number.

It is an amenable number.

91081116 is an abundant number, since it is smaller than the sum of its proper divisors (172042836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91081116 is a wasteful number, since it uses less digits than its factorization.

91081116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361450 (or 361445 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 91081116 is about 9543.6427007721. The cubic root of 91081116 is about 449.9277513639.

The spelling of 91081116 in words is "ninety-one million, eighty-one thousand, one hundred sixteen".