Fait mathématique: 2291 is the number of inequivalent Ferrers graphs with 29 points.
Culture générale: 2291 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: April 9th is the day in 1947 that the Journey of Reconciliation, the first interracial Freedom Ride begins through the upper South in violation of Jim Crow laws.