What is the single digit number of 3 to the power of 2007

What is the single digit number of 3 to the power of 2007

3 ^ 1 bits is 3
3 ^ 2 bits is 9
3 ^ 3 bits is 7
3 ^ 4 bits is 1
3 ^ 5 bits is 3
So it's a cycle of four
2007 / 4 remainder = 3
So 3 ^ 2007 digits = 3 ^ 3 digits = 7