Properties of the Number 9809

Nine Thousand Eight Hundred Nine

Basics

Value: 9808 → 9809 → 9810

Parity: odd

Prime: No

Previous Prime: 9803

Next Prime: 9811

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 17 × 577

Divisors: 1, 17, 577, 9809

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011001010001

Octal: 23121

Duodecimal: 5815

Hexadecimal: 2651

Square: 96216481

Square Root: 99.04039579888602

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Stella octangula numbers: a(n) = n*(2·n² - 1). A7588

Number of primes of the form 30k + 17 less than 10ⁿ. A91169

Sum of digits of n-th term in Look and Say sequence A005150. A4977

Composite numbers k coprime to 8 such that k divides Pell(k - Kronecker(8,k)), Pell = A000129. A327651

Number of factorizations with 2 levels of parentheses indexed by prime signatures. A050338(A025487). A50339

a(n) = n*(17·n - 1)/2. A22274

Denominators of continued fraction convergents to sqrt(958). A42855

Values of·in x² - 289 = 2·y². A106527

Small rhombicuboctahedron with faces of centered polygons. A193250

Numbers k such that φ(k) and σ(k) are both perfect squares. A67781