91873085 has 4 divisors (see below), whose sum is σ = 110247708. Its totient is φ = 73498464.

The previous prime is 91873043. The next prime is 91873097. The reversal of 91873085 is 58037819.

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: 58037819 = 7 ⋅8291117.

It can be written as a sum of positive squares in 2 ways, for example, as 22033636 + 69839449 = 4694^2 + 8357^2 .

It is a cyclic number.

It is not a de Polignac number, because 91873085 - 2⁶ = 91873021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9187304 + ... + 9187313.

It is an arithmetic number, because the mean of its divisors is an integer number (27561927).

Almost surely, 2^91873085 is an apocalyptic number.

It is an amenable number.

91873085 is a deficient number, since it is larger than the sum of its proper divisors (18374623).

91873085 is a wasteful number, since it uses less digits than its factorization.

91873085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18374622.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 91873085 is about 9585.0448616582. The cubic root of 91873085 is about 451.2280611797.

The spelling of 91873085 in words is "ninety-one million, eight hundred seventy-three thousand, eighty-five".