Hex #5b8d92 or rgb(91,141,146) in RGB space is the tint of cyan. It has hue angle of 185.45 degrees, value = 57 and saturation = 38. #5b8d92 can be obtained by mixing 4 colors: 1 drop of red, 4 drops of cyan, 4 drops of white, 5 drops of black.
Nearest safe hex - #669999. Below you can see the block with #5b8d92 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b8d92 to the mixer and play with it.