Maths puzzle

123456789101112
Across
  1. 4. square of 75
  2. 6. Cube of 9
  3. 7. smallest natural number other than 1 which is a square as well as a cube
  4. 9. missing number to make12, __, 37 a Pythagorean triplets
  5. 11. without adding find the sum of 1+3+5+7+9+11
  6. 12. smallest number to be multiplied to make 248 a perfect cube
Down
  1. 1. smallest square number that is divisible by both 5 and 11
  2. 2. cube root of 357911
  3. 3. square root of 4489
  4. 5. square of 19
  5. 8. smallest number which when added to 7669 makes the resultant a perfect square
  6. 10. number which when onehundredandfiftyone subtracted from 374695 makes the number a perfect square