243 (number)

In mathematics

• the only 3-digit number that is a fifth power.
• a perfect totient number.
• the sum of five consecutive prime numbers.
• an 82-gonal number.
• a Harshad number.

  In other fields

• the Calling code for the Democratic Republic of the Congo, the country once known as Zaire.
• the year 243 AD or 243 BC.
• an Aircraft emergency frequency for military aircraft.
• Aloha Airlines Flight 243 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 to complete one Venusian day, one revolution
• A song from Laggan Rhye with the title 3⁵ is about 3⁵ and 243, using the difference between a nautical mile and a statute mile in meters.