Hex #5d979b or rgb(93,151,155) in RGB space is the tint of cyan. It has hue angle of 183.87 degrees, value = 61 and saturation = 40. #5d979b can be obtained by mixing 4 colors: 4 drops of blue, 2 drops of green, 4 drops of white, 1 drop of black.
Nearest safe hex - #669999. Below you can see the block with #5d979b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5d979b to the mixer and play with it.