51st
The number 51 is the natural number following 50 and preceding 52. In Roman numerals, it is written as LI. In the decimal system, 51 is an odd number. It is a composite number, with its prime factorization being 3 × 17. The sum of its digits is 5 + 1 = 6.
In various contexts, the number 51 holds significance. For instance, the United States has 50 states, and