No zeros occur in this puzzle.

**Across**:

**A**: C across + E across.

**C**: a cubic number.

**E**: a square number.

**G**: this square number equals the product of the digits of A down.

**I**: a square number.

**J**: a palindrome.

**L**: a prime number.

**M**: a prime number.

**N**: M across plus the digit sum of L across.

**Down**:

**A**: a prime number.

**B**: a palindrome.

**C**: the digit product of C down is a divisor of G across.

**D**: A down + E across.

**F**: yhe product of the digits of A across.

**H**: M across + G across.

**I**: a perfect number (the sum of all of its divisors, including 1, but excluding itself).

**K**: a palindrome.

**L**: a square number.