91015912 has 32 divisors (see below), whose sum is σ = 185522400. Its totient is φ = 41609664.

The previous prime is 91015901. The next prime is 91015919. The reversal of 91015912 is 21951019.

It is not an unprimeable number, because it can be changed into a prime (91015919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7039 + ... + 15217.

It is an arithmetic number, because the mean of its divisors is an integer number (5797575).

Almost surely, 2^91015912 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 91015912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92761200).

91015912 is an abundant number, since it is smaller than the sum of its proper divisors (94506488).

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

91015912 is a wasteful number, since it uses less digits than its factorization.

91015912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8305 (or 8301 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 91015912 is about 9540.2259931304. The cubic root of 91015912 is about 449.8203595726.

The spelling of 91015912 in words is "ninety-one million, fifteen thousand, nine hundred twelve".