11809
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 13794
- Proper Divisor Sum (Aliquot Sum)
- 1985
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10080
- Möbius Function
- 0
- Radical
- 1687
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 112
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of perfect matchings (or domino tilings) in D_4 X P_(n-1).at n=10A003757
- Number of series-reduced planted compound windmills with n leaves.at n=10A032203
- a(n) = (2*n+1)*(10*n+1).at n=24A033574
- Numerators of continued fraction convergents to sqrt(461).at n=6A041878
- Number of unlabeled 2-connected minimally 2-edge-connected graphs with n nodes.at n=13A054317
- a(n) = floor(9^n/n).at n=4A129799
- Expansion of x*(1-x)*(1+x)/(1-13*x+36*x^2-13*x^3+x^4).at n=4A161498
- a(n) = 20*a(n-1) - 97*a(n-2) for n > 1; a(0) = 1, a(1) = 10.at n=4A162667
- The least number s having exactly n fours in the continued fraction of sqrt(s).at n=13A206584
- Number of (u,v,w,x,y,z) with all terms in {0,1,...,n} and 5u=v+w+x+y+z.at n=8A212242
- An avoidance sequence for a pair of tree patterns that is not the avoidance sequence for any set of permutations.at n=48A221720
- Number of partitions of n such that (number parts having multiplicity 1) is a part and (number of 1s) is a part.at n=41A241506
- 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.at n=36A261911
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 419", based on the 5-celled von Neumann neighborhood.at n=25A272047
- Number of partitions of n into an even number of parts that are not multiples of 3.at n=50A339404
- If F is the Fermat point of a triangle ABC with A < B < C < 2*Pi/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).at n=24A351476
- Integer part of the product of three consecutive primes divided by their sum.at n=41A376334
- Numbers of the form 12*k + 1 that satisfy Euler's condition for odd perfect numbers (A228058).at n=44A387404