Hex #158aaa or rgb(21,138,170) in RGB space is the tint of bluish cian. It has hue angle of 192.89 degrees, value = 67 and saturation = 88. #158aaa can be obtained by mixing 4 colors: 3 drops of blue, 5 drops of cyan, 1 drop of white, 3 drops of black.
Nearest safe hex - #009999. Below you can see the block with #158aaa color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #158aaa to the mixer and play with it.