193

193 is a prime number.

191 and 193 form a twin prime pair.

193 can be formed from the sum of the products of the first three twin prime pairs: 193 = 3 * 5 + 5 * 7 + 11 * 13.

193 can be written as the difference between the product and the sum of the first four primes: 193 = 2 * 3 * 5 * 7 - (2 + 3 + 5 + 7).

193 is the smallest prime whose reversal is a Smith number.

193 is the smallest prime whose fifth power (267785184193) contains all the digits from 1 to 9.

193 has a representation as a sum of two squares: 193 = 7² + 12².

193 is the hypotenuse of a primitive Pythagorean triple: 193² = 95² + 168².

Source: Prime Curios!