Number Facts and Trivia: 13

The Number 13

• Also known as...
• In words...
• English: thirteen
• Roman numeral: XIII
• Other bases...
• Base 2 (binary): 1101
• Base 8 (octal): 15
• Base 16 (hexadecimal): D
• Interesting facts and trivia...
• 13 is an odd number
• Prime or composite?   Prime
• Books and products about the number 13
• Other interesting facts and trivia...
• 13 is considered by many to be an unlucky number
• Movies
• 13 Going On 30 (2004)

If you have an interesting fact or trivia about the number 13, 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 July 3, 2008
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