Notable Numeral · entry
90209
T9 keypad
- WXYZ ⌷ ABC ⌷ WXYZ T9 phone-keypad letter set per digit
Leet
- POZOP leet substitution: 0=O, 1=I, 3=E, 4=A, 5=S, 7=T, etc.
- PO ZOP chunked 2+3, leet
- POZ OP chunked 3+2, leet
Math
- palindrome reads the same forwards and backwards
- 7 × 7 × 7 × 263 prime factorization