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This is in the spirit of the What is a Word/Phraseā¢ series started by JLee with a special brand of Phraseā¢ and Wordā¢ puzzles, and the likewise inspired What is a Numberā¢ series.
If a number conforms to a special rule, I call it a Reversible Numberā¢. If it doesn't, it might be an Irreversible N...