198259189 has 2 divisors, whose sum is σ = 198259190. Its totient is φ = 198259188.

The previous prime is 198259177. The next prime is 198259213. The reversal of 198259189 is 981952891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110986225 + 87272964 = 10535^2 + 9342^2 .

It is a cyclic number.

It is not a de Polignac number, because 198259189 - 2⁵ = 198259157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198259169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99129594 + 99129595.

It is an arithmetic number, because the mean of its divisors is an integer number (99129595).

Almost surely, 2^198259189 is an apocalyptic number.

It is an amenable number.

198259189 is a deficient number, since it is larger than the sum of its proper divisors (1).

198259189 is an equidigital number, since it uses as much as digits as its factorization.

198259189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 52.

The square root of 198259189 is about 14080.4541475053. The cubic root of 198259189 is about 583.1018801678.

The spelling of 198259189 in words is "one hundred ninety-eight million, two hundred fifty-nine thousand, one hundred eighty-nine".