6809009 has 4 divisors (see below), whose sum is σ = 6910704. Its totient is φ = 6707316.

The previous prime is 6808979. The next prime is 6809029. The reversal of 6809009 is 9009086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6809009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6809029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50747 + ... + 50880.

It is an arithmetic number, because the mean of its divisors is an integer number (1727676).

Almost surely, 2^6809009 is an apocalyptic number.

It is an amenable number.

6809009 is a deficient number, since it is larger than the sum of its proper divisors (101695).

6809009 is a wasteful number, since it uses less digits than its factorization.

6809009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101694.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 6809009 is about 2609.4077872192. The cubic root of 6809009 is about 189.5372765899.

The spelling of 6809009 in words is "six million, eight hundred nine thousand, nine".