NUM·LORE
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909

Tier · Algorithmic

Algorithmic encodings for 909.

adjacent   908  ·  910

T9 keypad

  • WXYZ ⌷ WXYZ

    T9 phone-keypad letter set per digit

Leet

  • POP

    leet substitution: 0=O, 1=I, 3=E, 4=A, 5=S, 7=T, etc.

Math

  • palindrome

    reads the same forwards and backwards

  • 3 × 3 × 101

    prime factorization