Fatto generale: 231 is the number of cubic inches in a U.S. liquid gallon.
Fatto matematico: 231 is a composite number, with its divisors being 2, 5, 10, 23, 46, and 115.
Trivia: 231 is the number of cubic inches in a U.S. liquid gallon.
Data storica: August 18th is the day in 1977 that Steve Biko is arrested at a police roadblock under the Terrorism Act No 83 of 1967 in King William's Town, South Africa.