168156389 has 2 divisors, whose sum is σ = 168156390. Its totient is φ = 168156388.

The previous prime is 168156383. The next prime is 168156407. The reversal of 168156389 is 983651861.

168156389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164275489 + 3880900 = 12817^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 168156389 - 2²⁰ = 167107813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168156383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84078194 + 84078195.

It is an arithmetic number, because the mean of its divisors is an integer number (84078195).

Almost surely, 2^168156389 is an apocalyptic number.

It is an amenable number.

168156389 is a deficient number, since it is larger than the sum of its proper divisors (1).

168156389 is an equidigital number, since it uses as much as digits as its factorization.

168156389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 47.

The square root of 168156389 is about 12967.5128301460. The cubic root of 168156389 is about 551.9559986018.

The spelling of 168156389 in words is "one hundred sixty-eight million, one hundred fifty-six thousand, three hundred eighty-nine".