243 (number)

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243
Cardinal two hundred [and] forty-three
Ordinal 243rd
(two hundred [and] forty-third)
Factorization 25
Roman numeral CCXLIII
Binary 111110011
Hexadecimal F3

243 (two hundred [and] forty-three) is the natural number following 242 and preceding 244.


[edit] In mathematics

243 is a power of 3.
243 is a perfect totient number.
It is the sum of five consecutive prime numbers (41 + 43 + 47 + 53 + 59).
Two hundred forty-three is also an 82-gonal number.

Harshad number

[edit] In other fields

243 is:

  • the Calling code for Zaire.
  • the number of isotopes or variations of elements calculated by Dr. Plichta.
  • the year 243 CE or 243 BCE.
  • the flight number of an Aloha Airlines flight which crashed near Maui, HI on April 28, 1988
  • The .243 Winchester is a very popular sporting rifle round
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