Funhouse Mirror

Standard sudoku rules apply: each row, column, and 3x3 box must contain all the digits from 1 to 9. Palindrome: digits along a thick grey line must read the same from either end. E.g. 2537352. There is one line from R4C1 to R1C4, and one line from R7C4 to R4C7. Arrows: digits along an arrow must sum to the value in the attached circle. Anti-knight: digits which are a chess knight's move apart must not be the same.