91082081091 has 4 divisors (see below), whose sum is σ = 121442774792. Its totient is φ = 60721387392.

The previous prime is 91082081081. The next prime is 91082081159. The reversal of 91082081091 is 19018028019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19018028019 = 3 ⋅6339342673.

It is not a de Polignac number, because 91082081091 - 2⁵ = 91082081059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91082081071) 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, 15180346846 + ... + 15180346851.

It is an arithmetic number, because the mean of its divisors is an integer number (30360693698).

Almost surely, 2^91082081091 is an apocalyptic number.

91082081091 is a deficient number, since it is larger than the sum of its proper divisors (30360693701).

91082081091 is a wasteful number, since it uses less digits than its factorization.

91082081091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30360693700.

The product of its (nonzero) digits is 10368, while the sum is 39.

The spelling of 91082081091 in words is "ninety-one billion, eighty-two million, eighty-one thousand, ninety-one".