291 (number)

From HandWiki
Short description: Natural number
← 290 291 292 →
Cardinaltwo hundred ninety-one
Ordinal291st
(two hundred ninety-first)
Factorization3 × 97
Divisors1, 3, 97, 291
Greek numeralΣϞΑ´
Roman numeralCCXCI
Binary1001000112
Ternary1012103
Quaternary102034
Quinary21315
Senary12036
Octal4438
Duodecimal20312
Hexadecimal12316
VigesimalEB20
Base 368336

291 is the natural number following 290 and preceding 292.

In mathematics

  • 291 is an odd composite number with two prime factor.[1]
  • 291 is a semiprime number meaning that it has 2 prime factors.[2]
  • 291 can be written as the sum of the nth prime plus n. It is the 52nd prime (239) plus 52.[3]
  • 291 is one of the positions of “c” in the tribonacci word abacabaab… defined by a->ab, b->ac, c->a.[4]
  • 291 is the sum of 6 different 4th powers. It is the sum of 44+24+24+14+14+14.[5]

World Records

  • On March 6, 2022, Tamara Walcott received the Guinness World Record for the elephant bar deadlift achieved by a woman. She lifted a weight of 291 kg.[6]
  • On December 19, 2021, the greatest number of cakes eaten online simultaneously was achieved in Tanba, Japan. There were 291 cakes.[7]
  • On October 25, 2014, the longest string instrument was created in Singapore. It was the ‘Earth Harp’ at a length of 291 m.[8]
  • On August 7, 2011, Fred Grsybowski achieved the Guinness World Record for the tallest usable pogo stick in Toronto. It was 2.91 m tall.[9]

Other fields

References