Hex #009091 or rgb(0,144,145) in RGB space is the tint of cyan. It has hue angle of 180.41 degrees, value = 57 and saturation = 100. #009091 can be obtained by mixing 4 colors: 1 drop of blue, 5 drops of cyan, 1 drop of green, 3 drops of black.
Nearest safe hex - #009999. Below you can see the block with #009091 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #009091 to the mixer and play with it.