524

524 = 2² x 131.

524 is a divisor of 53⁵ - 1.

6 x 7 x 9 x 524 x 831 = 164,597,832 uses each of the digits from 1 to 9 once on both sides of the equality.

524 is 201102 (palindromic) in base 3.

The USS Pickerel (USN-524) was a submarine commissioned in 1949.

Source: Positive Integers