6813809 has 4 divisors (see below), whose sum is σ = 6998004. Its totient is φ = 6629616.

The previous prime is 6813797. The next prime is 6813817. The reversal of 6813809 is 9083186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5276209 + 1537600 = 2297^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 6813809 - 2¹² = 6809713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6813899) 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, 92042 + ... + 92115.

It is an arithmetic number, because the mean of its divisors is an integer number (1749501).

Almost surely, 2^6813809 is an apocalyptic number.

It is an amenable number.

6813809 is a deficient number, since it is larger than the sum of its proper divisors (184195).

6813809 is a wasteful number, since it uses less digits than its factorization.

6813809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184194.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 6813809 is about 2610.3273741046. The cubic root of 6813809 is about 189.5818041283.

The spelling of 6813809 in words is "six million, eight hundred thirteen thousand, eight hundred nine".