49 (number)

In mathematics

Base 10 representation

Reciprocal

• 020408163265306122448979591836734693877551 × 2 = 040816326530612244897959183673469387755102
• 020408163265306122448979591836734693877551 × 3 = 061224489795918367346938775510204081632653
• 020408163265306122448979591836734693877551 × 4 = 081632653061224489795918367346938775510204
• ...

In chemistry

• The atomic number of indium.
• During the Manhattan Project, plutonium was also often referred to, simply, as "49". Number 4 was for the last digit in 94 and 9 for the last digit in Pu-239, the weapon-grade fissile isotope used in nuclear bombs.

  In astronomy

• Messier object M49, a magnitude 10.0 galaxy in the constellation Virgo.
• The New General Catalogue NGC 49, a spiral galaxy in the constellation Cetus.

  In religion

• In Judaism, the number of days of the Counting of the Omer
• The number of days and night Siddhartha Gautama spent meditating as a holy man
• In Buddhism, 49 days is one of the lengths of the intermediate state

  In sports

• 49er, a member of the NFL's San Francisco 49ers.
• Arsenal had a 49-game unbeaten run between May 2003 and October 2004 until they lost to Manchester United, which is a national record in English football.
• Rocky Marciano ended his career as the only heavyweight champion with a perfect record—49 wins in 49 professional bouts, with 43 knockouts.

  In music

• "49 Bye-Byes", a song on the self-titled album Crosby Stills and Nash
• "Days of 49", a Bob Dylan song on the album Self Portrait
• is a one-track solo album by Paul Westerberg.
• In Blues music lore, it was at the junction of US Highway 49 and 61 in Clarksdale, Mississippi, that legendary bluesman Robert Johnson sold his soul to the devil in return for fame and success. In later years Howlin' Wolf immortalized the road in the song “Highway 49”, originally written by Big Joe Williams.

  In other fields

• HP-49 series is a Hewlett Packard calculator
• 49er, one who participated in the 1849 California Gold Rush.
• The code for international direct dial phone calls to Germany
• In the title of Thomas Pynchon's novel The Crying of Lot 49
• In the title of the movies Ladder 49 and 49 Up
• A 49 is a party after a powwow or any gathering of American Indians, held by the participants. It is also type of song that is sung on such occasions. A 49 is typically held in an isolated place and features drumming and singing.
• 49th parallel between Canada and the USA
• Japanese GS1 country code
• The number of the French department Maine-et-Loire