Hex #509d65 or rgb(80,157,101) in RGB space is the tint of bluish green. It has hue angle of 136.36 degrees, value = 62 and saturation = 49. #509d65 can be obtained by mixing 4 colors: 5 drops of yellow, 2 drops of blue, 5 drops of cyan, 4 drops of black.
Nearest safe hex - #669966. Below you can see the block with #509d65 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #509d65 to the mixer and play with it.