11643
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 15528
- Proper Divisor Sum (Aliquot Sum)
- 3885
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7760
- Möbius Function
- 1
- Radical
- 11643
- Omega Function (Ω)
- 2
- 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
- 55
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- 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 labeled graded partially ordered sets with n elements of height at most 1.at n=6A001831
- Lucky numbers with size of gaps equal to 16 (lower terms).at n=36A031898
- Number of ways to partition n labeled elements into pie slices each of at least 2 elements.at n=8A032181
- a(n) = n*(n^4 + 10*n^3 + 35*n^2 + 50*n + 144)/120.at n=14A051745
- First differences of A047780.at n=8A100790
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.at n=9A148802
- Partial sums of A036967.at n=15A176273
- Numbers of ways in which a unit disc can be dissected into 6n curvilinear triangles, at least one of which does not contain the center.at n=24A193362
- Number of n X 2 0..2 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the sum of elements above it, modulo 3.at n=40A238806
- a(n) is the number of integers that can be represented in a 7-segment display by using only n segments (version A006942).at n=19A350437
- a(n) = 1 + Sum_{k=2..n} (-1)^k * k^2 * a(floor(n/k)).at n=34A361983
- a(n) = 1 + Sum_{k=2..n} (-1)^k * k^2 * a(floor(n/k)).at n=35A361983
- Triangular array read by rows. T(n,k) is the number of idempotent binary relations on [n] having no proper power primitive (A360718) with exactly k irreflexive points.at n=13A370208
- Indices of records in A045537.at n=26A373942