9991085 has 32 divisors (see below), whose sum is σ = 13886208. Its totient is φ = 6842880.

The previous prime is 9991067. The next prime is 9991123. The reversal of 9991085 is 5801999.

9991085 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9991085 - 2¹⁸ = 9728941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

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, 61214 + ... + 61376.

It is an arithmetic number, because the mean of its divisors is an integer number (433944).

Almost surely, 2^9991085 is an apocalyptic number.

It is an amenable number.

9991085 is a deficient number, since it is larger than the sum of its proper divisors (3895123).

9991085 is a wasteful number, since it uses less digits than its factorization.

9991085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 9991085 is about 3160.8677605999. The cubic root of 9991085 is about 215.3794273508.

The spelling of 9991085 in words is "nine million, nine hundred ninety-one thousand, eighty-five".