Hex #158b9c or rgb(21,139,156) in RGB space is the tint of bluish cian. It has hue angle of 187.56 degrees, value = 61 and saturation = 87. #158b9c can be obtained by mixing 4 colors: 1 drop of red, 5 drops of blue, 4 drops of cyan, 2 drops of green.
Nearest safe hex - #009999. Below you can see the block with #158b9c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #158b9c to the mixer and play with it.