168085289 has 2 divisors, whose sum is σ = 168085290. Its totient is φ = 168085288.

The previous prime is 168085279. The next prime is 168085319. The reversal of 168085289 is 982580861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92256025 + 75829264 = 9605^2 + 8708^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168085289 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (168085249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84042644 + 84042645.

It is an arithmetic number, because the mean of its divisors is an integer number (84042645).

Almost surely, 2^168085289 is an apocalyptic number.

It is an amenable number.

168085289 is a deficient number, since it is larger than the sum of its proper divisors (1).

168085289 is an equidigital number, since it uses as much as digits as its factorization.

168085289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 168085289 is about 12964.7710739527. The cubic root of 168085289 is about 551.8781948301.

The spelling of 168085289 in words is "one hundred sixty-eight million, eighty-five thousand, two hundred eighty-nine".