91081105 has 4 divisors (see below), whose sum is σ = 109297332. Its totient is φ = 72864880.

The previous prime is 91081099. The next prime is 91081147. The reversal of 91081105 is 50118019.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36084049 + 54997056 = 6007^2 + 7416^2 .

It is not a de Polignac number, because 91081105 - 2³ = 91081097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91081105.

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, 9108106 + ... + 9108115.

It is an arithmetic number, because the mean of its divisors is an integer number (27324333).

Almost surely, 2^91081105 is an apocalyptic number.

It is an amenable number.

91081105 is a deficient number, since it is larger than the sum of its proper divisors (18216227).

91081105 is a wasteful number, since it uses less digits than its factorization.

91081105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18216226.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 91081105 is about 9543.6421244722. The cubic root of 91081105 is about 449.9277332511.

The spelling of 91081105 in words is "ninety-one million, eighty-one thousand, one hundred five".