What is 51?

Since you didn't specify what context the number 51 is being used in, here are some different pieces of information:

In mathematics:

• 51 is a composite number, meaning it is not a prime number.
• It has three factors: 1, 3, and 17.
• Its prime factorization is 3 x 17.
• 51 is the 10th Lucas number.

In science:

• 51 is the atomic number of antimony.
• The boiling point of mercury is 51 degrees Celsius.

In sports:

• 51 is a common jersey number in baseball, often worn by pitchers or catchers.
• The longest field goal in NFL history was made from 51 yards away.
• Tennis player Novak Djokovic won 51 matches in a row in 2011.

In culture:

• Area 51 is a highly secretive United States Air Force facility located in Nevada.
• The movie "51st State" (also known as "Formula 51") stars Samuel L. Jackson as a chemist trying to create a new drug.
• The number 51 is often associated with being in the middle of life, as the average human lifespan in many countries is around 76 years old.