Riddle: I am a being with many faces. My first is peaceful and calm, but can kill you. My second is strong enough to smash ships but still fears the sun. My third flies when it's born and runs when it's dead. My fourth goes away and never returns. What am I?
Riddle: This number added to it's square, and the digits of that summation added together, bring it back to itself. What is it?
Answer: 3. 3 squared is 9. 3+9=12. Take the two digits of the summation and add them; 1+2=3. In short; 3-9-12-3. This can also work with the number 0 and 9.
Summation Riddle Meme with riddle and answer link.