There are several state and county roads with that number, and there's Interstate 81.
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Odd Numbered Interstates go north-south Even Numbered Interstates go east-to-west The higher numbered interstates are in the north (ex. I-90, I-80) The lower numbered interstates are in the south (ex. I-4, I-10)
81
A wrong-way concurrency is a road concurrency in the United States in which two numbered highway routes are signed in opposite, conflicting directions on the same stretch of roadway.
It is 81*81*81. Which is 531,441.
9² = 9 × 9 = 81