91081156 has 12 divisors (see below), whose sum is σ = 160609680. Its totient is φ = 45192680.

The previous prime is 91081147. The next prime is 91081169. The reversal of 91081156 is 65118019.

It is a super-3 number, since 3×91081156³ (a number of 25 digits) contains 333 as substring.

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, 86386 + ... + 87433.

It is an arithmetic number, because the mean of its divisors is an integer number (13384140).

Almost surely, 2^91081156 is an apocalyptic number.

It is an amenable number.

91081156 is a deficient number, since it is larger than the sum of its proper divisors (69528524).

91081156 is a wasteful number, since it uses less digits than its factorization.

91081156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173954 (or 173952 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 91081156 is about 9543.6447964077. The cubic root of 91081156 is about 449.9278172286.

The spelling of 91081156 in words is "ninety-one million, eighty-one thousand, one hundred fifty-six".