Hex #15571d or rgb(21,87,29) in RGB space is the tint of green. It has hue angle of 127.27 degrees, value = 34 and saturation = 76. #15571d can be obtained by mixing 4 colors: 1 drop of red, 2 drops of blue, 5 drops of green, 4 drops of black.
Nearest safe hex - #006633. Below you can see the block with #15571d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #15571d to the mixer and play with it.