91391110109 has 16 divisors (see below), whose sum is σ = 98703601920. Its totient is φ = 84119186880.

The previous prime is 91391110099. The next prime is 91391110127. The reversal of 91391110109 is 90101119319.

It is a cyclic number.

It is not a de Polignac number, because 91391110109 - 2¹² = 91391106013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91391110159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14323682 + ... + 14330060.

It is an arithmetic number, because the mean of its divisors is an integer number (6168975120).

Almost surely, 2^91391110109 is an apocalyptic number.

It is an amenable number.

91391110109 is a deficient number, since it is larger than the sum of its proper divisors (7312491811).

91391110109 is a wasteful number, since it uses less digits than its factorization.

91391110109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9380.

The product of its (nonzero) digits is 2187, while the sum is 35.

The spelling of 91391110109 in words is "ninety-one billion, three hundred ninety-one million, one hundred ten thousand, one hundred nine".