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197 (one hundred ninety-seven) is the natural number following 196 and preceding 198.

In mathematics

• 197 is a prime number, 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, and 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 Schröder–Hipparchus number, counting for instance the number of ways of subdividing a heptagon by a non-crossing set of its diagonals.

In other fields

197 is also:

• A police emergency telephone number in Tunisia
• Number enquiry telephone number in Nepal
• A song by Norwegian alternative rock group Major Parkinson from their self-titled debut album
• Currently the number countries in the world: 193 voting UN Member states + 2 non-voting observer states (Vatican City and Palestine) + Taiwan + Kosovo = 197 grand total

See also

• The year AD 197 or 197 BC
• List of highways numbered 197
• All pages with titles containing 197

References

1. Sloane, N. J. A. (ed.). "Sequence A001003 (Schroeder's second problem (generalized parentheses); also called super-Catalan numbers or little Schroeder numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.

• Integers