Properties of the Number 11909

Eleven Thousand Nine Hundred Nine

Basics

Value: 11908 → 11909 → 11910

Parity: odd

Prime: Yes

Previous Prime: 11903

Next Prime: 11923

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 11909

Divisors: 1, 11909

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10111010000101

Octal: 27205

Duodecimal: 6A85

Hexadecimal: 2e85

Square: 141824281

Square Root: 109.12836478203089

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

Primes that remain prime through 3 iterations of the function f(x) = 2·x + 1. A23272

Primes having only {0, 1, 9} as digits. A199329

Primes starting a Cunningham chain of the first kind of length 4. A59763

T(n,k) = Number of n X k 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4. A241356

Primes of the form k² + (k+1)² + (k+2)² = 3*(k+1)²+2. A27864

Wiener index of a benzenoid consisting of a spiral chain of n hexagons (s=1; see the Gutman et al. reference). A193391

Numbers n such that n, 2n+1, 3n+2, 4n+3 are primes. A67257

Beginning with 3, least member of A007500 such that concatenation of first n terms and its digit reversal both are primes. A111383

Denominators of upper primes-only best approximates (POBAs) to sqrt(3); see Comments. A265781

Primes that yield a different prime when rotated by 180 degrees. A48890