# 197 (number)

This article may contain indiscriminate, excessive, or irrelevant examples. (March 2010) |

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Cardinal | one hundred ninety-seven | |||

Ordinal |
197th (one hundred ninety-seventh) | |||

Factorization | prime | |||

Prime | 45th | |||

Greek numeral | ΡϞΖ´ | |||

Roman numeral | CXCVII | |||

Binary |
11000101_{2} | |||

Ternary |
21022_{3} | |||

Quaternary |
3011_{4} | |||

Quinary |
1242_{5} | |||

Senary |
525_{6} | |||

Octal |
305_{8} | |||

Duodecimal |
145_{12} | |||

Hexadecimal |
C5_{16} | |||

Vigesimal |
9H_{20} | |||

Base 36 |
5H_{36} |

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

## Contents

## In mathematics[edit]

- 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
^{[1]} - 197 is a palindromic prime in base 14 (101).
- 197 is a square-free number
- 197 is a super Catalan number
^{[2]} - 197 is an Ulam number
- 197 is the sum of the 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

## In geography[edit]

- 197 Yonge Street, site of the former Canadian Bank of Commerce building
- House at 197 Hornbine Road, Rehoboth, Massachusetts
- House at 197 Morrison Avenue, Somerville, Massachusetts

## In music[edit]

- "197" is a song by Norwegian alternative rock group Major Parkinson from their self-titled debut album

## In other fields[edit]

** 197** is also:

- Is a police emergency telephone number in Tunisia
- The year AD 197 or 197 BC
- The atomic number of an element temporarily called Unennseptium
- 197 Arete is a Main belt asteroid. It has a very bright surface, unusually bright even for a rocky S-type asteroid
- Minuscule 197 is a Greek minuscule manuscript of the New Testament, on parchment

## See also[edit]

- List of highways numbered 197
- United Nations Security Council Resolution 197
- United States Supreme Court cases, Volume 197
- Pennsylvania House of Representatives, District 197
- Polo Independent Order of Odd Fellows Lodge No. 197
- P.S. 197, Brooklyn, New York

## References[edit]

**^**"Sloane's A007629 : Repfigit numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-05-28.**^**"Sloane's 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. Retrieved 2016-05-28.

## External links[edit]

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