Geometry
# Surface Area

Brilli the ant is playing with a ball of radius $R$, which is a positive integer. Given that the surface area and volume of the ball are $N\pi$ and $M\pi$, where $N$ and $M$ are 4-digit integers, what is $R$?

**Details and assumptions**

The number $12=012$ is a 2-digit number, not a 3-digit number.