91381192 has 64 divisors (see below), whose sum is σ = 202561920. Its totient is φ = 37836288.

The previous prime is 91381187. The next prime is 91381193. The reversal of 91381192 is 29118319.

It is not an unprimeable number, because it can be changed into a prime (91381193) 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, 329758 + ... + 330034.

It is an arithmetic number, because the mean of its divisors is an integer number (3165030).

Almost surely, 2^91381192 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 91381192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101280960).

91381192 is an abundant number, since it is smaller than the sum of its proper divisors (111180728).

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

91381192 is a wasteful number, since it uses less digits than its factorization.

91381192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 466 counting only the distinct ones).

The product of its digits is 3888, while the sum is 34.

The square root of 91381192 is about 9559.3510239974. The cubic root of 91381192 is about 450.4213206342.

The spelling of 91381192 in words is "ninety-one million, three hundred eighty-one thousand, one hundred ninety-two".