198005189 has 2 divisors, whose sum is σ = 198005190. Its totient is φ = 198005188.

The previous prime is 198005179. The next prime is 198005201. The reversal of 198005189 is 981500891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123321025 + 74684164 = 11105^2 + 8642^2 .

It is a cyclic number.

It is not a de Polignac number, because 198005189 - 2¹² = 198001093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198005179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99002594 + 99002595.

It is an arithmetic number, because the mean of its divisors is an integer number (99002595).

Almost surely, 2^198005189 is an apocalyptic number.

It is an amenable number.

198005189 is a deficient number, since it is larger than the sum of its proper divisors (1).

198005189 is an equidigital number, since it uses as much as digits as its factorization.

198005189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 198005189 is about 14071.4316613485. The cubic root of 198005189 is about 582.8527598574.

The spelling of 198005189 in words is "one hundred ninety-eight million, five thousand, one hundred eighty-nine".