Properties of the Number 9

Nine

Basics

Value: 8 → 9 → 10

Parity: odd

Prime: No

Previous Prime: 7

Next Prime: 11

Digit Sum: 9

Digital Root: 9

Palindrome: Yes

Factorization: 3 ²

Divisors: 1, 3, 9

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001

Octal: 11

Duodecimal: 9

Hexadecimal: 9

Square: 81

Square Root: 3

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: Yes

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: Yes

OEIS Sequences

No sequences found.