806609 has 2 divisors, whose sum is σ = 806610. Its totient is φ = 806608.

The previous prime is 806581. The next prime is 806639. The reversal of 806609 is 906608.

806609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 760384 + 46225 = 872^2 + 215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-806609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (806639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403304 + 403305.

It is an arithmetic number, because the mean of its divisors is an integer number (403305).

2⁸⁰⁶⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

806609 is a deficient number, since it is larger than the sum of its proper divisors (1).

806609 is an equidigital number, since it uses as much as digits as its factorization.

806609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 806609 is about 898.1141352857. The cubic root of 806609 is about 93.0867114342.

Subtracting 806609 from its reverse (906608), we obtain a palindrome (99999).

The spelling of 806609 in words is "eight hundred six thousand, six hundred nine".