168855389 has 2 divisors, whose sum is σ = 168855390. Its totient is φ = 168855388.

The previous prime is 168855361. The next prime is 168855437. The reversal of 168855389 is 983558861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156675289 + 12180100 = 12517^2 + 3490^2 .

It is a cyclic number.

It is not a de Polignac number, because 168855389 - 2¹⁶ = 168789853 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168855389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168855319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84427694 + 84427695.

It is an arithmetic number, because the mean of its divisors is an integer number (84427695).

Almost surely, 2^168855389 is an apocalyptic number.

It is an amenable number.

168855389 is a deficient number, since it is larger than the sum of its proper divisors (1).

168855389 is an equidigital number, since it uses as much as digits as its factorization.

168855389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2073600, while the sum is 53.

The square root of 168855389 is about 12994.4368481285. The cubic root of 168855389 is about 552.7197397881.

The spelling of 168855389 in words is "one hundred sixty-eight million, eight hundred fifty-five thousand, three hundred eighty-nine".