91391168 has 56 divisors (see below), whose sum is σ = 202509120. Its totient is φ = 40561920.

The previous prime is 91391143. The next prime is 91391189. The reversal of 91391168 is 86119319.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28763 + ... + 31781.

Almost surely, 2^91391168 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 91391168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101254560).

91391168 is an abundant number, since it is smaller than the sum of its proper divisors (111117952).

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

91391168 is a wasteful number, since it uses less digits than its factorization.

91391168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3085 (or 3075 counting only the distinct ones).

The product of its digits is 11664, while the sum is 38.

The square root of 91391168 is about 9559.8728025011. The cubic root of 91391168 is about 450.4377107304.

The spelling of 91391168 in words is "ninety-one million, three hundred ninety-one thousand, one hundred sixty-eight".