91038805 has 32 divisors (see below), whose sum is σ = 129322368. Its totient is φ = 60652800.

The previous prime is 91038803. The next prime is 91038817. The reversal of 91038805 is 50883019.

It is not a de Polignac number, because 91038805 - 2¹ = 91038803 is a prime.

It is a Smith number, since the sum of its digits (34) 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 not an unprimeable number, because it can be changed into a prime (91038803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111850 + ... + 112660.

It is an arithmetic number, because the mean of its divisors is an integer number (4041324).

Almost surely, 2^91038805 is an apocalyptic number.

It is an amenable number.

91038805 is a deficient number, since it is larger than the sum of its proper divisors (38283563).

91038805 is a wasteful number, since it uses less digits than its factorization.

91038805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 91038805 is about 9541.4257320382. The cubic root of 91038805 is about 449.8580704666.

The spelling of 91038805 in words is "ninety-one million, thirty-eight thousand, eight hundred five".