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?
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