Hex #559397 or rgb(85,147,151) in RGB space is the tint of cyan. It has hue angle of 183.64 degrees, value = 59 and saturation = 44. #559397 can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of red, 2 drops of blue, 4 drops of cyan.
Nearest safe hex - #669999. Below you can see the block with #559397 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559397 to the mixer and play with it.