215

215 = 5 x 43.

215 is a number that cannot be written as a sum of three squares.

215 is 3113 in base 4 and 555 in base 6.

215³ = 9,938,375 = (99 + 38 + 3 + 75)³.

215 = 31³ - 1.

215 is a telephone area code for the city of Philadelphia.

Source: Numeropedia