|Cardinal||two hundred sixty-one|
(two hundred sixty-first)
|Factorization||32 × 29|
|Divisors||1, 3, 9, 29, 87, 261|
261 was once the lowest number not to have its own Wikipedia page, this making it a candidate for the lowest uninteresting Number according to the definition given by Alex Bellos. As of September 2018[update], the smallest natural number without its own Wikipedia page is 262, and the smallest prime number without its own Wikipedia page is 283.
In other fields
261 may refer to:
- 261 AD, a calendar year
- 261 AM, a radio frequency
- 261 BC, a calendar year
- 261 Fearless, a non-profit organization started by Kathrine Switzer, who in 1967 wore bib number 261 when she became the first woman to run the Boston Marathon as a numbered entrant
- +261, a country calling code; see telephone numbers in Madagascar
- H.261, an video compression standard
- Military / transportation
- Flight 261, several airliner incidents
- German submarine U-261, which was sunk in 1942
- KiHa 261 series, a type of diesel train in Japan
- Messerschmitt Me 261, an airplane of the late 1930s
- Milwaukee Road 261, a restored steam locomotive built in 1944
- No. 261 Squadron RAF, of World War I and World War II
- VMM-261, a United States Marine Corps squadron
- 261 Prymno, a minor planet
- Kosmos 261, a Soviet satellite launched in 1968
- NGC 261, a diffuse nebula located in the constellation Tucana
- See also
- "Facts about the number 261". Numbermatics - the number explorer. Retrieved 2017-03-20.
- "Number Gossip: 261". www.numbergossip.com. Retrieved 2017-03-20.
- Bellos, Alex (June 2014). The Grapes of Math: How Life Reflects Numbers and Numbers Reflect Life. illus. The Surreal McCoy (1st Simon & Schuster hardcover ed.). N.Y.: Simon & Schuster. pp. 238 & 319 (quoting p. 319). ISBN 978-1-4516-4009-0.