The Resting Energy of a Neutron is 939.56532974522 MeV.
The neutron is a subatomic hadron particle that has the symbol n or n0. Neutrons have no net electric charge and a mass slightly larger than that of a proton. With the exception of hydrogen-1, the nucleus of every atom consists of at least one neutron as well as one or more protons.
The resting energy of a neutron is based on the mass of the neutron and atomic energy equation E = mc².
The mass of a neutron is 1.00866491588 u which is equivalent to 939.56532974522 MeV/c²