12345...54321 (97-digits)

This number is a prime.

                                               1234567 8987654321 2345678987
6543212345 6789876543 2123456789 8765432123 4567898765 4321234567 8987654321

The largest 'Peak and Valley' prime (i.e., prime of the form 12345678987654321...12345678987654321). [Patterson]