Hex #158ea3 or rgb(21,142,163) in RGB space is the tint of bluish cian. It has hue angle of 188.87 degrees, value = 64 and saturation = 87. #158ea3 can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of blue, 5 drops of cyan, 2 drops of black.
Nearest safe hex - #009999. Below you can see the block with #158ea3 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #158ea3 to the mixer and play with it.