What is the energy equivalent of an object with a mass of 4.1 kg?

To determine the energy equivalent of an object, we use the famous equation of Einstein which is E=mc^2 where m is the mass of the object and c is the speed of light (3x10^8 m/s). We calculate as follows:

E = mc^2
E = 4.1 kg (3x10^8 m/s)^2
E = 3.69x10^17 J