ACROSS
1. All digits are odd and all different.
5. Sum of the digits is half the cube root of 3 DOWN.
6. A prime number.
8. Three times the sum of its digits.
9. This number reversed is the square of an even number.
11. This is the same when reversed, and it is divisible by 9.
DOWN
1. First three digits of 4 DOWN rearranged.
2. A prime number.
3. A perfect cube.
4. Each digit is greater than the preceding one.
7. A multiple of 8 ACROSS.
10. The sum of the digits is the square of a perfect square.