Calculating a planet's mass & gravitational pull

[Andrés]

Let's see what I remember from my physics classes.
Gravity on earht should be 9.8 m/s2 pronounced "meters per square second". Meaning the speed of an object in free fall will increase in 9,8 m/s every second.
So you seem to have the point shifted several spaces.

No, rotation should actually create a centrifugal force that will pull you away from the planet and tend to lower gravity close to the equator.