3225

3225 = 3 x 5 x 5 x 43.

3225 is 100400 in base 5. It is 22533 in base 6.

3225 is the number of primes less than 10⁵ having at least one digit 6 (A091707).

3225 is the sum of the first 41 primes, minus 41 (A101301).

3225 is the number of symmetric 3 x 3 matrices in base 5 with determinant 0.

3225 divides 49⁶ - 1.

Source: What's Special About This Number?