There can be no equivalence.
A kilogram is a measure of mass. A gallon is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider a gallon of air. How many kilograms? Next consider a gallon of water. How many kilograms?
The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.
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The answer depends on 2547 WHAT!
1000 gr is equal to 1 kg, therefore 4.1 gr is equal 4.1/1000 kg = 0.0041 kg
0.51 kg = 510,000 milligrams.
It is approx 25.4 kg.
250,000,000