Surface Gravity of a Neutron Star

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A neutron star with a mass five times that of Earth and a radius of 10 km requires calculations for a satellite's orbital distance. The mass was converted to 10^31 kg, and the satellite's speed was converted to 833,333 m/s. The equation v = √(GM/R) was used, but the result of -10,000 m indicates an error in the calculations. Clarification is needed on the units for mass and gravitational constant to ensure accurate results. Understanding these units is essential for correctly applying the formula.
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A neutron star has a mass five times that of Earth and a 10 KM radius. Find the distance from this star's surface a satellite must be at to stay in a circular orbit if the satellite is moving at 50000 km/min.

First, I changed the 10 KM to meters and found the mass of this neutron star. Then, I changed the 50000 km/min to 833,333 m/s (tell me if this is incorrect). Next, I used the equation v = squareroot GM/R and plugged in (6.67 x 10 to the negative eleventh power) for G and (10 to the 31st power) for M and the radius is unknown. I came up with -10,000 m, which is obviously incorrect. Am i doing something wrong?
 
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How did you get 10^31 for M? And what units? g or kg? What unit does the formula require?
 
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