9
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9
Last single digit, symbol of completion. Magic property: every multiple of 9 has digits summing to a multiple of 9 (9×7=63, 6+3=9). In China, 9 is imperial — only the Emperor could display 9 dragons.
🔬 Factorize
🔗 GCD / LCM
🔄 Base converter
👑 Next prime
÷ Divisors of N
✖️ × table
⬆️ Powers
🔁 Modulo N
mod
🌀 Collatz sequence
∑ Sum 1..N