9089991 has 12 divisors (see below), whose sum is σ = 13701168. Its totient is φ = 5796384.

The previous prime is 9089989. The next prime is 9090007. The reversal of 9089991 is 1999809.

It is not a de Polignac number, because 9089991 - 2¹ = 9089989 is a prime.

9089991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9089921) 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 11 ways as a sum of consecutive naturals, for example, 21750 + ... + 22163.

It is an arithmetic number, because the mean of its divisors is an integer number (1141764).

Almost surely, 2^9089991 is an apocalyptic number.

9089991 is a deficient number, since it is larger than the sum of its proper divisors (4611177).

9089991 is a wasteful number, since it uses less digits than its factorization.

9089991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43942 (or 43939 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 9089991 is about 3014.9611937801. The cubic root of 9089991 is about 208.6993762526.

The spelling of 9089991 in words is "nine million, eighty-nine thousand, nine hundred ninety-one".