168889789 has 2 divisors, whose sum is σ = 168889790. Its totient is φ = 168889788.

The previous prime is 168889769. The next prime is 168889837. The reversal of 168889789 is 987988861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155625625 + 13264164 = 12475^2 + 3642^2 .

It is an emirp because it is prime and its reverse (987988861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168889789 - 2⁹ = 168889277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168889789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168889709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84444894 + 84444895.

It is an arithmetic number, because the mean of its divisors is an integer number (84444895).

Almost surely, 2^168889789 is an apocalyptic number.

It is an amenable number.

168889789 is a deficient number, since it is larger than the sum of its proper divisors (1).

168889789 is an equidigital number, since it uses as much as digits as its factorization.

168889789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13934592, while the sum is 64.

The square root of 168889789 is about 12995.7604240768. The cubic root of 168889789 is about 552.7572714458.

The spelling of 168889789 in words is "one hundred sixty-eight million, eight hundred eighty-nine thousand, seven hundred eighty-nine".