6810809 has 2 divisors, whose sum is σ = 6810810. Its totient is φ = 6810808.

The previous prime is 6810803. The next prime is 6810841. The reversal of 6810809 is 9080186.

It is an a-pointer prime, because the next prime (6810841) can be obtained adding 6810809 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4644025 + 2166784 = 2155^2 + 1472^2 .

It is a cyclic number.

It is not a de Polignac number, because 6810809 - 2²⁰ = 5762233 is a prime.

It is not a weakly prime, because it can be changed into another prime (6810803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3405404 + 3405405.

It is an arithmetic number, because the mean of its divisors is an integer number (3405405).

Almost surely, 2^6810809 is an apocalyptic number.

It is an amenable number.

6810809 is a deficient number, since it is larger than the sum of its proper divisors (1).

6810809 is an equidigital number, since it uses as much as digits as its factorization.

6810809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 6810809 is about 2609.7526702736. The cubic root of 6810809 is about 189.5539768684.

The spelling of 6810809 in words is "six million, eight hundred ten thousand, eight hundred nine".