91100001091 has 6 divisors (see below), whose sum is σ = 100134712076. Its totient is φ = 82818182700.

The previous prime is 91100001089. The next prime is 91100001151. The reversal of 91100001091 is 19010000119.

It is not a de Polignac number, because 91100001091 - 2¹ = 91100001089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91100001071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 376446165 + ... + 376446406.

Almost surely, 2^91100001091 is an apocalyptic number.

91100001091 is a deficient number, since it is larger than the sum of its proper divisors (9034710985).

91100001091 is a wasteful number, since it uses less digits than its factorization.

91100001091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752892593 (or 752892582 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 22.

Multiplying 91100001091 by its sum of digits (22), we get a palindrome (2004200024002).

The spelling of 91100001091 in words is "ninety-one billion, one hundred million, one thousand, ninety-one".