197 (Number)

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- 197 is an odd number
- 197 is a prime number
- 197 is a Chen prime
- 197 is an Eisenstein prime with no imaginary part
- 197 is a strong prime
- 197 is a twin prime with 199
- 197 is the third of a prime quadruplet: 191, 193, 197, 199
- 197 is the smallest prime number that is the sum of 7 consecutive primes: 17 + 19 + 23 + 29 + 31 + 37 + 41
- 197 is the sum of the first twelve prime numbers: 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37
- 197 is a centered heptagonal number, a centered figurate number that represents a heptagon with a dot in the center and all other dots surrounding the center dot in successive heptagonal layers
- 197 is a deficient number, as 1 is less than 197
- 197 is a Keith or repfigit number
- 197 is a square-free number
- 197 is super Catalan number
- 197 is an Ulam number
- 197 is the difference of 2 square numbers: 99<sup>2</sup> - 98<sup>2</sup>
- 197 is the sum of all digits of all two-digit prime numbers: 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
- The binary number of 197 has four 1 digits and four zeroes...... ...

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