Fatto generale: 181 is the number of athletes from Belarus competed in 28 events at the 2008 Olympics in Beijing.
Fatto matematico: 181 is an undulating number, if written in the ternary, the negaternary, or the nonary numeral systems.
Trivia: 181 is the atomic number of an element temporarily called Unoctunium.
Data storica: June 29th is the day in 1644 that Charles I of England defeats a Parliamentarian detachment at the Battle of Cropredy Bridge, the last battle won by an English King on English soil.