Hex #159f9c or rgb(21,159,156) in RGB space is the tint of cyan. It has hue angle of 178.70 degrees, value = 62 and saturation = 87. #159f9c can be obtained by mixing 4 colors: 1 drop of yellow, 5 drops of blue, 4 drops of cyan, 2 drops of green.
Nearest safe hex - #009999. Below you can see the block with #159f9c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #159f9c to the mixer and play with it.