It's quite acceptable to call it a 181-agon but what's more important is knowing how to work out its properties.
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I would call it a 181-gon. Keep it simple! Not only is the use of long Greek prefices pretentious, you will only annoy the reader who will probably have to consult a dictionary.
181 can only go in 0 1 and 181 that is all for the number 181
1 x 181, 181 x 1
10.3% of 181 = 0.103 x 181= 18.643
its already simplified. the solution would be √181