91185005 has 8 divisors (see below), whose sum is σ = 109523832. Its totient is φ = 72880128.

The previous prime is 91184999. The next prime is 91185053. The reversal of 91185005 is 50058119.

It can be written as a sum of positive squares in 4 ways, for example, as 37982569 + 53202436 = 6163^2 + 7294^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91185005 - 2⁶ = 91184941 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 7 ways as a sum of consecutive naturals, for example, 2144 + ... + 13673.

It is an arithmetic number, because the mean of its divisors is an integer number (13690479).

Almost surely, 2^91185005 is an apocalyptic number.

It is an amenable number.

91185005 is a deficient number, since it is larger than the sum of its proper divisors (18338827).

91185005 is a wasteful number, since it uses less digits than its factorization.

91185005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16975.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 91185005 is about 9549.0839874828. The cubic root of 91185005 is about 450.0987519900.

The spelling of 91185005 in words is "ninety-one million, one hundred eighty-five thousand, five".