168804809 has 2 divisors, whose sum is σ = 168804810. Its totient is φ = 168804808.

The previous prime is 168804803. The next prime is 168804817. The reversal of 168804809 is 908408861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148913209 + 19891600 = 12203^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 168804809 - 2⁴ = 168804793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168804809.

It is not a weakly prime, because it can be changed into another prime (168804803) 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, 84402404 + 84402405.

It is an arithmetic number, because the mean of its divisors is an integer number (84402405).

Almost surely, 2^168804809 is an apocalyptic number.

It is an amenable number.

168804809 is a deficient number, since it is larger than the sum of its proper divisors (1).

168804809 is an equidigital number, since it uses as much as digits as its factorization.

168804809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 168804809 is about 12992.4904848916. The cubic root of 168804809 is about 552.6645459000.

The spelling of 168804809 in words is "one hundred sixty-eight million, eight hundred four thousand, eight hundred nine".