6805509 has 4 divisors (see below), whose sum is σ = 9074016. Its totient is φ = 4537004.

The previous prime is 6805507. The next prime is 6805529. The reversal of 6805509 is 9055086.

6805509 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 6805509 - 2¹ = 6805507 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 6805509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6805501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1134249 + ... + 1134254.

It is an arithmetic number, because the mean of its divisors is an integer number (2268504).

Almost surely, 2^6805509 is an apocalyptic number.

It is an amenable number.

6805509 is a deficient number, since it is larger than the sum of its proper divisors (2268507).

6805509 is a wasteful number, since it uses less digits than its factorization.

6805509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268506.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 6805509 is about 2608.7370507585. The cubic root of 6805509 is about 189.5047953990.

The spelling of 6805509 in words is "six million, eight hundred five thousand, five hundred nine".