Fatto matematico: 4931 is a value of n for which 2n and 7n together use the digits 1-9 exactly once.
Trivia: 4931 is an uninteresting number.
Data storica: July 1st is the day in 1960 that Ghana becomes a Republic and Kwame Nkrumah becomes its first President as Queen Elizabeth II of the United Kingdom ceases to be its Head of state.