985568189 has 2 divisors, whose sum is σ = 985568190. Its totient is φ = 985568188.

The previous prime is 985568179. The next prime is 985568249. The reversal of 985568189 is 981865589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 569204164 + 416364025 = 23858^2 + 20405^2 .

It is an emirp because it is prime and its reverse (981865589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 985568189 - 2¹⁶ = 985502653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985568179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492784094 + 492784095.

It is an arithmetic number, because the mean of its divisors is an integer number (492784095).

Almost surely, 2^985568189 is an apocalyptic number.

It is an amenable number.

985568189 is a deficient number, since it is larger than the sum of its proper divisors (1).

985568189 is an equidigital number, since it uses as much as digits as its factorization.

985568189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6220800, while the sum is 59.

The square root of 985568189 is about 31393.7603513819. The cubic root of 985568189 is about 995.1660670772.

The spelling of 985568189 in words is "nine hundred eighty-five million, five hundred sixty-eight thousand, one hundred eighty-nine".