In Mathematics
- 193 is an odd number
- 193 is a centered 32-gonal number
- 193 is a deficient number, as 1 is less than 193
- 193 is a happy number
- 193 is a lucky number
- 193 is an odious number
- 193 is a square-free number
- 193 is the sum of 2 square numbers: 122 + 72 (or 144 + 49)
- 193 is the difference of 2 square numbers: 972 - 962 (or 9409 - 9216)
- Divisors of 193: 1, 193
- 193 is a prime number
- 193 is a Cuban prime
- 193 is a full reptend prime
- 193 is a Pierpont prime
- 193 is a Pillai prime
- 193 is a Proth prime, as it is 3 × 26 + 1
- 193 is a Twin prime with 191
- 193 is the only odd prime p known for which 2 is not a primitive root of .
- 193/71 is the most accurate approximation of Euler's Number (e) such that both the numerator and the denominator are integers less than 200 (approx. 99.99897% accurate)
Read more about this topic: 193 (number)
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“... though mathematics may teach a man how to build a bridge, it is what the Scotch Universities call the humanities, that teach him to be civil and sweet-tempered.”
—Amelia E. Barr (1831–1919)