91082058205 has 4 divisors (see below), whose sum is σ = 109298469852. Its totient is φ = 72865646560.

The previous prime is 91082058173. The next prime is 91082058211. The reversal of 91082058205 is 50285028019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50285028019 = 3547 ⋅14176777.

It can be written as a sum of positive squares in 2 ways, for example, as 15678545796 + 75403512409 = 125214^2 + 274597^2 .

It is not a de Polignac number, because 91082058205 - 2⁵ = 91082058173 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9108205816 + ... + 9108205825.

It is an arithmetic number, because the mean of its divisors is an integer number (27324617463).

Almost surely, 2^91082058205 is an apocalyptic number.

It is an amenable number.

91082058205 is a deficient number, since it is larger than the sum of its proper divisors (18216411647).

91082058205 is a wasteful number, since it uses less digits than its factorization.

91082058205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18216411646.

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 91082058205 in words is "ninety-one billion, eighty-two million, fifty-eight thousand, two hundred five".