91409371184 has 80 divisors (see below), whose sum is σ = 189903916800. Its totient is φ = 42494107392.

The previous prime is 91409371177. The next prime is 91409371199. The reversal of 91409371184 is 48117390419.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11600654 + ... + 11608530.

It is an arithmetic number, because the mean of its divisors is an integer number (2373798960).

Almost surely, 2^91409371184 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 91409371184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94951958400).

91409371184 is an abundant number, since it is smaller than the sum of its proper divisors (98494545616).

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

91409371184 is a wasteful number, since it uses less digits than its factorization.

91409371184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8610 (or 8604 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 91409371184 in words is "ninety-one billion, four hundred nine million, three hundred seventy-one thousand, one hundred eighty-four".