Hex #158f87 or rgb(21,143,135) in RGB space is the tint of cyan. It has hue angle of 176.07 degrees, value = 56 and saturation = 85. #158f87 can be obtained by mixing 4 colors: 1 drop of magenta, 4 drops of blue, 3 drops of cyan, 4 drops of green.
Nearest safe hex - #009999. Below you can see the block with #158f87 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #158f87 to the mixer and play with it.