91171332 has 120 divisors (see below), whose sum is σ = 277273920. Its totient is φ = 25583040.

The previous prime is 91171321. The next prime is 91171361. The reversal of 91171332 is 23317119.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 91171296 and 91171305.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 138019 + ... + 138677.

It is an arithmetic number, because the mean of its divisors is an integer number (2310616).

Almost surely, 2^91171332 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 91171332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138636960).

91171332 is an abundant number, since it is smaller than the sum of its proper divisors (186102588).

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

91171332 is a wasteful number, since it uses less digits than its factorization.

91171332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743 (or 732 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 91171332 is about 9548.3680280978. The cubic root of 91171332 is about 450.0762537445.

The spelling of 91171332 in words is "ninety-one million, one hundred seventy-one thousand, three hundred thirty-two".