99009 has 16 divisors (see below), whose sum is σ = 155200. Its totient is φ = 62208.

The previous prime is 98999. The next prime is 99013. The reversal of 99009 is 90099.

It is not a de Polignac number, because 99009 - 2⁴ = 98993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417 + ... + 609.

It is an arithmetic number, because the mean of its divisors is an integer number (9700).

2⁹⁹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

99009 is a deficient number, since it is larger than the sum of its proper divisors (56191).

99009 is a wasteful number, since it uses less digits than its factorization.

99009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 27.

The square root of 99009 is about 314.6569560649. The cubic root of 99009 is about 46.2620518872.

The spelling of 99009 in words is "ninety-nine thousand, nine".