What are at least nineteen facts relevant to the integer 19?

Answer 1

1 It's a prime and rational odd integer number

2 It's an integer because it's a whole number

3 It's a Prime number because it only has 2 factors

4 It's an odd number because it's not divisible by 2 with no remainder

5 It can be expressed as 19/1 as a fraction

6 It can be expressed as 38/2 as an equivalent fraction

7 It can be expressed as 19.0 as a decimal

8 It can be expressed as 1900% as a percentage

9 Its reciprocal is 1/19

10 It maybe can be expressed as 18 and 19/19 as a mixed number

11 It's a perfect square when multiplied together

12 Its square root is an irrational number

13 It's XVIIII in ancient Roman numerals

14 It's IXX in ancient abridged Roman numerals

15 It's XIX in todays modern usage of Roman numerals

16 Its Latin name is novemdecim meaning 19

17 Its other Latin name is undeviginti meaning 1 from 20

18 It has no Latin name for todays modern usage of XIX

19 It's an acute angle when expressed as 19 degrees

20 It has 152 diagonals when formed into a 19 sided polygon

21 Its digital sum is 1 which is neither a prime nor a composite number