Fatto generale: 243 is the Calling code for Zaire.
Fatto matematico: 243 is the sum of five consecutive prime numbers (41 + 43 + 47 + 53 + 59).
Trivia: 243 is the number of isotopes or variations of elements calculated by Dr. Plichta.
Data storica: August 30th is the day in 1974 that a powerful bomb explodes at the Mitsubishi Heavy Industries headquarters in Marunouchi, Tokyo, Japan.