168105389 has 2 divisors, whose sum is σ = 168105390. Its totient is φ = 168105388.

The previous prime is 168105383. The next prime is 168105409. The reversal of 168105389 is 983501861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131102500 + 37002889 = 11450^2 + 6083^2 .

It is an emirp because it is prime and its reverse (983501861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168105389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168105383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84052694 + 84052695.

It is an arithmetic number, because the mean of its divisors is an integer number (84052695).

Almost surely, 2^168105389 is an apocalyptic number.

It is an amenable number.

168105389 is a deficient number, since it is larger than the sum of its proper divisors (1).

168105389 is an equidigital number, since it uses as much as digits as its factorization.

168105389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 168105389 is about 12965.5462283700. The cubic root of 168105389 is about 551.9001922134.

The spelling of 168105389 in words is "one hundred sixty-eight million, one hundred five thousand, three hundred eighty-nine".