291 (number)

Short description: Natural number

← 290 291 292 →
← 200 210 220 230 240 250 260 270 280 290 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred ninety-one
Ordinal	291st (two hundred ninety-first)
Factorization	3 × 97
Divisors	1, 3, 97, 291
Greek numeral	ΣϞΑ´
Roman numeral	CCXCI
Binary	1001000112
Ternary	1012103
Quaternary	102034
Quinary	21315
Senary	12036
Octal	4438
Duodecimal	20312
Hexadecimal	12316
Vigesimal	EB20
Base 36	8336

291 is the natural number following 290 and preceding 292.

In mathematics

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

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.
• On December 19, 2021, the greatest number of cakes eaten online simultaneously was achieved in Tanba, Japan. There were 291 cakes.
• On October 25, 2014, the longest string instrument was created in Singapore. It was the ‘Earth Harp’ at a length of 291 m.
• 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.

Other fields

• The calendar years 291 AD and 291 BC.
• 291 is the number for several highways across the countries of Canada , Japan , and the United States .
• 291 Alice is an asteroid in the asteroid belt. It was discovered by Johann Palisa in Vienna, Austria.