291 (number)

291 is the natural number following 290 and preceding 292.

In mathematics

291 is an odd composite number with two prime factors.^[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]

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]

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.^[10]