243 (two hundred
ndforty-three) is the
natural number
In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country").
Numbers used for counting are called ''cardinal ...
following
242
Year 242 (Roman numerals, CCXLII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Gratus and Lepidus (or, less frequently, year 995 ...
and preceding
244
__NOTOC__
Year 244 (Roman numerals, CCXLIV) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Tiberius Pollenius Armenius Peregrinus, Arm ...
.
In mathematics
243 is:
*the only 3-digit number that is a fifth power (3
5).
*a
perfect totient number.
*the sum of five consecutive
prime number
A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways ...
s (41 + 43 + 47 + 53 + 59).
*an 82-
gonal number.
In other fields
243 is:
* the Calling code for the
Democratic Republic of the Congo
The Democratic Republic of the Congo (french: République démocratique du Congo (RDC), colloquially "La RDC" ), informally Congo-Kinshasa, DR Congo, the DRC, the DROC, or the Congo, and formerly and also colloquially Zaire, is a country in ...
, the country once known as
Zaire
Zaire (, ), officially the Republic of Zaire (french: République du Zaïre, link=no, ), was a Congolese state from 1971 to 1997 in Central Africa that was previously and is now again known as the Democratic Republic of the Congo. Zaire was, ...
.
* the year
243 AD or
243 BC
__NOTOC__
Year 243 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Fundulus and Galus (or, less frequently, year 511 '' Ab urbe condita''). The denomination 243 BC for this year has been ...
.
* an
Aircraft emergency frequency (243.0 MHz) for military aircraft.
*
Aloha Airlines Flight 243
Aloha Airlines Flight 243 (IATA: AQ243, ICAO: AAH243) was a scheduled Aloha Airlines flight between Hilo and Honolulu in Hawaii. On April 28, 1988, a Boeing 737-297 serving the flight suffered extensive damage after an explosive decompression i ...
which suffered an explosive decompression near
Maui, HI on April 28, 1988
*
.243 Winchester and
.243 WSSM, rifle rounds
* The number of Earth Days for the planet
Venus
Venus is the second planet from the Sun. It is sometimes called Earth's "sister" or "twin" planet as it is almost as large and has a similar composition. As an interior planet to Earth, Venus (like Mercury) appears in Earth's sky never f ...
to complete one Venusian day, one revolution
References
Integers
{{Num-stub