91117445800 has 24 divisors (see below), whose sum is σ = 211848061950. Its totient is φ = 36446978240.

The previous prime is 91117445789. The next prime is 91117445803. The reversal of 91117445800 is 854471119.

It can be written as a sum of positive squares in 3 ways, for example, as 47341926724 + 43775519076 = 217582^2 + 209226^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (91117445803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 227793415 + ... + 227793814.

Almost surely, 2^91117445800 is an apocalyptic number.

It is an amenable number.

91117445800 is an abundant number, since it is smaller than the sum of its proper divisors (120730616150).

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

91117445800 is a wasteful number, since it uses less digits than its factorization.

91117445800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455587245 (or 455587236 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 91117445800 in words is "ninety-one billion, one hundred seventeen million, four hundred forty-five thousand, eight hundred".