2606809 has 2 divisors, whose sum is σ = 2606810. Its totient is φ = 2606808.

The previous prime is 2606803. The next prime is 2606833. The reversal of 2606809 is 9086062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1550025 + 1056784 = 1245^2 + 1028^2 .

It is a cyclic number.

It is not a de Polignac number, because 2606809 - 2⁹ = 2606297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2606803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1303404 + 1303405.

It is an arithmetic number, because the mean of its divisors is an integer number (1303405).

2^2606809 is an apocalyptic number.

It is an amenable number.

2606809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2606809 is an equidigital number, since it uses as much as digits as its factorization.

2606809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 2606809 is about 1614.5615503907. The cubic root of 2606809 is about 137.6268185344.

The spelling of 2606809 in words is "two million, six hundred six thousand, eight hundred nine".