91745831117 has 12 divisors (see below), whose sum is σ = 96551975100. Its totient is φ = 87167834688.

The previous prime is 91745831083. The next prime is 91745831141. The reversal of 91745831117 is 71113854719.

It can be written as a sum of positive squares in 2 ways, for example, as 42972875401 + 48772955716 = 207299^2 + 220846^2 .

It is not a de Polignac number, because 91745831117 - 2⁶ = 91745831053 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 (91745831147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 503168 + ... + 660809.

It is an arithmetic number, because the mean of its divisors is an integer number (8045997925).

Almost surely, 2^91745831117 is an apocalyptic number.

It is an amenable number.

91745831117 is a deficient number, since it is larger than the sum of its proper divisors (4806143983).

91745831117 is a wasteful number, since it uses less digits than its factorization.

91745831117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164172 (or 1164149 counting only the distinct ones).

The product of its digits is 211680, while the sum is 47.

The spelling of 91745831117 in words is "ninety-one billion, seven hundred forty-five million, eight hundred thirty-one thousand, one hundred seventeen".