5211 has a square root (72.18725649309...) whose decimal part starts with the digits 1 to 9 in some order (A034277).
Representations of 5211 in base 5, 7, and 8 use only the digits 1, 2, and 3 (A037431 and A037438).
5211 is a composite number with a digit product of 10 (A199990 and A201057).
5211 and the square of 5211 use only the digits 1, 2, 4, 5, and 7 (A136989).
5211 divides 8518 - 1.
Source: What's Special About This Number?
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