91110000013 has 4 divisors (see below), whose sum is σ = 91208074140. Its totient is φ = 91011925888.

The previous prime is 91110000001. The next prime is 91110000017. The reversal of 91110000013 is 31000001119.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31000001119 = 127 ⋅244094497.

It can be written as a sum of positive squares in 2 ways, for example, as 26844200964 + 64265799049 = 163842^2 + 253507^2 .

It is a cyclic number.

It is not a de Polignac number, because 91110000013 - 2⁹ = 91109999501 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 (91110000017) 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 3 ways as a sum of consecutive naturals, for example, 49035670 + ... + 49037527.

It is an arithmetic number, because the mean of its divisors is an integer number (22802018535).

Almost surely, 2^91110000013 is an apocalyptic number.

It is an amenable number.

91110000013 is a deficient number, since it is larger than the sum of its proper divisors (98074127).

91110000013 is an equidigital number, since it uses as much as digits as its factorization.

91110000013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98074126.

The product of its (nonzero) digits is 27, while the sum is 16.

The spelling of 91110000013 in words is "ninety-one billion, one hundred ten million, thirteen", and thus it is an aban number.