131080256
This number is a composite.
131080256 is equal to the sum of the nonprime proper
divisors of 131080256, i.e., 131080256 = 1 + 4 + 8 + 16 +
32 + 64 + 254 + 508 + 1016 + 2032 + 4064 + 8128 + 32254 +
64508 + 129016 + 258032 + 516064 + 1032128 + 2048129 +
4096258 + 8192516 + 16385032 + 32770064 + 65540128. See PC1316. [Eldar]
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