91158912 has 128 divisors (see below), whose sum is σ = 289884000. Its totient is φ = 28035072.

The previous prime is 91158911. The next prime is 91158917. The reversal of 91158912 is 21985119.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91158911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43914 + ... + 45942.

Almost surely, 2^91158912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91158912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144942000).

91158912 is an abundant number, since it is smaller than the sum of its proper divisors (198725088).

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

91158912 is a wasteful number, since it uses less digits than its factorization.

91158912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2065 (or 2047 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 91158912 is about 9547.7176330262. The cubic root of 91158912 is about 450.0558152989.

The spelling of 91158912 in words is "ninety-one million, one hundred fifty-eight thousand, nine hundred twelve".