181 is a prime number.
181 can be represented as the sum of two squares: 92 + 102 = 181.
181 is the hypotenuse of a primitive Pythagorean triple: 1812 = 192 + 1802.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfc5_GtgNcrLIElCUUqvxY-s3dcoB5EdpY_mXjDOAgoYsG0QfEQmHi-oArCPDFlzOPJuVBEbce8ypQlWK8GWFkaAzcXK-VkkmUYaifc40DMjMHhSR-ztSywG1uZ6CUGdWtG_OEINn-WCg/s400/n0181.jpg)
181 is a centered square number.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgohUpYqvqrJPpTvJm2UUxoRb9SBV-wmLnM_osW6XZbV-jJ1-lzEN7sfZ86LYorHalBC5S1kVbGd_68130gw9sD7z-A-tQuoJ4EZ0cP0Z89ZcrKCcBK5swycsxMFYzJxmQQz5h66n59GU4/s400/n0181.1.gif)
Rusty Romeos was the 181st short film starring the Three Stooges, released October 17, 1957.
Source: Wikipedia
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