Properties of the Number 11809

Eleven Thousand Eight Hundred Nine

Basics

Value: 11808 → 11809 → 11810

Parity: odd

Prime: No

Previous Prime: 11807

Next Prime: 11813

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 7 ² × 241

Divisors: 1, 7, 49, 241, 1687, 11809

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10111000100001

Octal: 27041

Duodecimal: 6A01

Hexadecimal: 2e21

Square: 139452481

Square Root: 108.66922287382016

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

Number of partitions of n such that (number parts having multiplicity 1) is a part and (number of 1s) is a part. A241506

Number of perfect matchings (or domino tilings) in D₄ X P_n-1. A3757

If F is the Fermat point of a triangle ABC with A < B < C < 2*π/3, where AB, BC, CA, FA, FB and FC are all positive integers, then, this sequence gives the sum FA + FB + FC when gcd(a, b, c) = A351477(n). A351476

Number of unlabeled 2-connected minimally 2-edge-connected graphs with n nodes. A54317

a(n) = floor(9ⁿ/n). A129799

The least number s having exactly n fours in the continued fraction of sqrt(s). A206584

Numbers n which are neither palindromes nor the sum of two palindromes, with property that the largest palindrome which when subtracted from n yields the sum of two palindromes is not the palindromic floor of n (A261423(n)), but rather the next palindrome below that. A261911

Number of partitions of n into an even number of parts that are not multiples of 3. A339404

Numerators of continued fraction convergents to sqrt(461). A41878

a(n) = (4 + (-9)ⁿ)/5. A83294