Hex #15949c or rgb(21,148,156) in RGB space is the tint of cyan. It has hue angle of 183.56 degrees, value = 61 and saturation = 87. #15949c can be obtained by mixing 4 colors: 1 drop of magenta, 4 drops of blue, 4 drops of cyan, 3 drops of green.
Nearest safe hex - #009999. Below you can see the block with #15949c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #15949c to the mixer and play with it.