981

981 = 3² x 109.

981 has a representation as a sum of two squares: 981 = 9² + 30².

327 + 654 = 981 uses each of the digits 1-9 once.

981 and 981² = 962,361 have the same initial digit and final digit.

Turkish Airlines Flight 981 was a McDonnell Douglas DC-10 that crashed in France in 1974, killing all 346 people on board.

Source: Numeropedia