This number is a prime.
Just showing those entries submitted by 'Ace': (Click here to show all)
The composer Béla Bartók finished his Opus 19 in 1919, when he was 38 (twice 19) years old; the title in his native Hungarian (A csodálatos mandarin) has 19 letters. [Ace]
There are 19 visible diamond patterns on the surface of a fully formed rhombic triacontahedron when structured using a series of phi-ratio pyramids. An example being Roger von Oech's Ball of Whacks. [Trace]