998000189 has 2 divisors, whose sum is σ = 998000190. Its totient is φ = 998000188.

The previous prime is 998000177. The next prime is 998000191. The reversal of 998000189 is 981000899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 608608900 + 389391289 = 24670^2 + 19733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998000189 is a prime.

Together with 998000191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998000789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499000094 + 499000095.

It is an arithmetic number, because the mean of its divisors is an integer number (499000095).

Almost surely, 2^998000189 is an apocalyptic number.

It is an amenable number.

998000189 is a deficient number, since it is larger than the sum of its proper divisors (1).

998000189 is an equidigital number, since it uses as much as digits as its factorization.

998000189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 998000189 is about 31591.1409892077. The cubic root of 998000189 is about 999.3329514785.

The spelling of 998000189 in words is "nine hundred ninety-eight million, one hundred eighty-nine", and thus it is an aban number.