# 197 (number)

Short description: Natural number
 ← 196 197 198 →
Cardinalone hundred ninety-seven
Ordinal197th
(one hundred ninety-seventh)
Factorizationprime
Prime45th
Greek numeralΡϞΖ´
Roman numeralCXCVII
Binary110001012
Ternary210223
Quaternary30114
Quinary12425
Senary5256
Octal3058
Duodecimal14512
Vigesimal9H20
Base 365H36

197 (one hundred [and] 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.[1]

## 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