91110918144 has 96 divisors (see below), whose sum is σ = 244396020960. Its totient is φ = 30183653376.

The previous prime is 91110918127. The next prime is 91110918193. The reversal of 91110918144 is 44181901119.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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, 955984 + ... + 1046960.

It is an arithmetic number, because the mean of its divisors is an integer number (2545791885).

Almost surely, 2^91110918144 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 91110918144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122198010480).

91110918144 is an abundant number, since it is smaller than the sum of its proper divisors (153285102816).

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

91110918144 is a wasteful number, since it uses less digits than its factorization.

91110918144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91165 (or 91145 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 39.

The spelling of 91110918144 in words is "ninety-one billion, one hundred ten million, nine hundred eighteen thousand, one hundred forty-four".