198559243 has 2 divisors, whose sum is σ = 198559244. Its totient is φ = 198559242.

The previous prime is 198559223. The next prime is 198559307. The reversal of 198559243 is 342955891.

It is a weak prime.

It is an emirp because it is prime and its reverse (342955891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198559243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198559193 and 198559202.

It is not a weakly prime, because it can be changed into another prime (198559213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99279621 + 99279622.

It is an arithmetic number, because the mean of its divisors is an integer number (99279622).

Almost surely, 2^198559243 is an apocalyptic number.

198559243 is a deficient number, since it is larger than the sum of its proper divisors (1).

198559243 is an equidigital number, since it uses as much as digits as its factorization.

198559243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 46.

The square root of 198559243 is about 14091.1051021558. The cubic root of 198559243 is about 583.3958957299.

The spelling of 198559243 in words is "one hundred ninety-eight million, five hundred fifty-nine thousand, two hundred forty-three".