168437189 has 2 divisors, whose sum is σ = 168437190. Its totient is φ = 168437188.

The previous prime is 168437177. The next prime is 168437221. The reversal of 168437189 is 981734861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94906564 + 73530625 = 9742^2 + 8575^2 .

It is an emirp because it is prime and its reverse (981734861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168437189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168407189) 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, 84218594 + 84218595.

It is an arithmetic number, because the mean of its divisors is an integer number (84218595).

Almost surely, 2^168437189 is an apocalyptic number.

It is an amenable number.

168437189 is a deficient number, since it is larger than the sum of its proper divisors (1).

168437189 is an equidigital number, since it uses as much as digits as its factorization.

168437189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 168437189 is about 12978.3353709172. The cubic root of 168437189 is about 552.2630600906.

The spelling of 168437189 in words is "one hundred sixty-eight million, four hundred thirty-seven thousand, one hundred eighty-nine".