11619
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 16796
- Proper Divisor Sum (Aliquot Sum)
- 5177
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7740
- Möbius Function
- 0
- Radical
- 3873
- 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
- 50
- 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
- 11*n^2 + 11*n + 3.at n=32A006222
- Number of refactorable integers (A033950) of binary order (A029837) n.at n=19A036761
- Interprimes which are of the form s*prime, s=9.at n=36A075284
- a(n) = 3*(2*n^2 + 1).at n=44A097803
- a(n) is the smallest positive number such that a(n)*n is an anagram of a(n)*9.at n=12A175698
- 1/16 the number of (n+1) X 4 binary arrays with no 2 X 2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.at n=4A183805
- 1/16 the number of (n+1)X6 binary arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.at n=2A183807
- T(n,k)=1/16 the number of (n+1)X(k+1) binary arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.at n=23A183811
- T(n,k)=1/16 the number of (n+1)X(k+1) binary arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.at n=25A183811
- Dispersion of A047204, (numbers >1 and congruent to 3 or 4 mod 5), by antidiagonals.at n=55A191731
- Number of partitions of n into 6 parts such that every i-th smallest part (counted with multiplicity) is different from i.at n=40A244242
- Numbers k such that 7*8^k - 1 is prime.at n=6A268061
- Triangle of the coefficients of Touchard's chord enumerating polynomials, [x^k] S(n,x), 0 <= k <= n*(n-1)/2.at n=50A322398
- Triprimes a such that, if b is the next triprime, a + b and b - a are also triprimes.at n=48A365833
- Array read by downward antidiagonals: T(n,k) is the number of partitions of [n], n >= 1, k >= 1, into cycles labeled with positive integers, such that the labels sum to k.at n=51A388788