909000009 has 8 divisors (see below), whose sum is σ = 1346666720. Its totient is φ = 605999988.

The previous prime is 908999947. The next prime is 909000031. The reversal of 909000009 is 900000909.

It is not a de Polignac number, because 909000009 - 2⁸ = 908999753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 33666667 = 909000009 / (9 + 0 + 9 + 0 + 0 + 0 + 0 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (909004009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16833307 + ... + 16833360.

It is an arithmetic number, because the mean of its divisors is an integer number (168333340).

Almost surely, 2^909000009 is an apocalyptic number.

It is an amenable number.

909000009 is a deficient number, since it is larger than the sum of its proper divisors (437666711).

909000009 is a wasteful number, since it uses less digits than its factorization.

909000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33666676 (or 33666670 counting only the distinct ones).

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

The square root of 909000009 is about 30149.6270126182. The cubic root of 909000009 is about 968.6970172952.

The spelling of 909000009 in words is "nine hundred nine million, nine", and thus it is an aban number.