What is 81 (number)?
{{wiktionary|eighty-one}} {{dablink|This article is about the number eighty-one. For the year, see [[81]].}}{{Infobox number|number=81}} '''Eighty-one''' is a [[number]]. It comes between [[80 (number)|eighty]] and [[82 (number)|eighty-two]], and is an [[odd number]]. It is also a [[square number]]. {{Math-stub}} [[Category:Square numbers]] [[Category:Integers]]