Number Facts and Trivia: 81

The Number 81

• Also known as...
• In words...
• English: eighty one
• Roman numeral: LXXXI
• Other bases...
• Base 2 (binary): 1010001
• Base 8 (octal): 121
• Base 16 (hexadecimal): 51
• Interesting facts and trivia...
• 81 is an odd number
• Prime or composite?   Composite.  The factors are:   3   3   3   3          
• 81 = 3⁴
• 81 = 9²
• Books and products about the number 81
• Other interesting facts and trivia...

If you have an interesting fact or trivia about the number 81, send us the information in an email using the Contact link at the bottom of the page.

Return to our Number Facts and Trivia page.

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Updated on November 6, 2004  |  Displayed on May 9, 2008
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