5169

5169 = 3 x 1723.

5169 is a number that can be written using its own digits in order and by using addition and factorial operators (A195670): 5169 = 5! + (1 + 6)!  + 9.

5169 is a semiprime that is the sum of distinct factorials (A115646).

5169 is the sum of the divisors of twice a square number (A065765): 2 x 41² = 3362 and 5169 = 1 + 2 + 41 + 82 + 1681 + 3362.

5169 is a divisor of 41⁶ - 1.

5169 is the lowest common multiple of 3 and n² + n + 1 for n = 41 (A130723).

Source: What's Special About This Number?