|Cardinal||One hundred [and]|
193 is a prime number, the only odd prime p known for which 2 is not a primitive root of . 193 is a cuban prime, and a twin prime with 191. It is also a happy and lucky prime. 193 is a Proth prime as it is 3 × 26 + 1. It can be written as the difference between the product and the sum of the first four primes.