Hex #009a91 or rgb(0,154,145) in RGB space is the tint of cyan. It has hue angle of 176.49 degrees, value = 60 and saturation = 100. #009a91 can be obtained by mixing 3 colors: 4 drops of blue, 3 drops of cyan, 3 drops of green.
Nearest safe hex - #009999. Below you can see the block with #009a91 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #009a91 to the mixer and play with it.