Hex #15a0b2 or rgb(21,160,178) in RGB space is the tint of cyan. It has hue angle of 186.88 degrees, value = 70 and saturation = 88. #15a0b2 can be obtained by mixing 4 colors: 5 drops of blue, 4 drops of cyan, 2 drops of green, 1 drop of white.
Nearest safe hex - #009999. Below you can see the block with #15a0b2 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #15a0b2 to the mixer and play with it.