168026809 has 2 divisors, whose sum is σ = 168026810. Its totient is φ = 168026808.

The previous prime is 168026797. The next prime is 168026839. The reversal of 168026809 is 908620861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146894400 + 21132409 = 12120^2 + 4597^2 .

It is a cyclic number.

It is not a de Polignac number, because 168026809 - 2⁹ = 168026297 is a prime.

It is not a weakly prime, because it can be changed into another prime (168026839) 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, 84013404 + 84013405.

It is an arithmetic number, because the mean of its divisors is an integer number (84013405).

Almost surely, 2^168026809 is an apocalyptic number.

It is an amenable number.

168026809 is a deficient number, since it is larger than the sum of its proper divisors (1).

168026809 is an equidigital number, since it uses as much as digits as its factorization.

168026809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 168026809 is about 12962.5155351884. The cubic root of 168026809 is about 551.8141845081.

The spelling of 168026809 in words is "one hundred sixty-eight million, twenty-six thousand, eight hundred nine".