Fait mathématique: 5252 is the maximum number of regions space can be divided into by 26 spheres.
Culture générale: 5252 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: May 18th is the day in 1991 that Northern Somalia declares independence from the rest of Somalia as the Republic of Somaliland but is not recognized by the international community.