168368209 has 2 divisors, whose sum is σ = 168368210. Its totient is φ = 168368208.

The previous prime is 168368203. The next prime is 168368261. The reversal of 168368209 is 902863861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150601984 + 17766225 = 12272^2 + 4215^2 .

It is a cyclic number.

It is not a de Polignac number, because 168368209 - 2³ = 168368201 is a prime.

It is not a weakly prime, because it can be changed into another prime (168368201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84184104 + 84184105.

It is an arithmetic number, because the mean of its divisors is an integer number (84184105).

Almost surely, 2^168368209 is an apocalyptic number.

It is an amenable number.

168368209 is a deficient number, since it is larger than the sum of its proper divisors (1).

168368209 is an equidigital number, since it uses as much as digits as its factorization.

168368209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 168368209 is about 12975.6775930970. The cubic root of 168368209 is about 552.1876604562.

The spelling of 168368209 in words is "one hundred sixty-eight million, three hundred sixty-eight thousand, two hundred nine".