16533
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
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 26208
- Proper Divisor Sum (Aliquot Sum)
- 9675
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 9960
- Möbius Function
- 0
- Radical
- 5511
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- 159
- 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
- Numbers whose base-4 representation contains exactly three 0's and four 1's.at n=26A045032
- Number of factorizations with 3 levels of parentheses indexed by prime signatures. A050340(A025487).at n=29A050341
- Numbers of unrooted hypermaps on the torus with n darts up to orientation-preserving homeomorphism (darts are semi-edges in the particular case of ordinary maps).at n=5A118094
- Number of 6-element nondividing subsets of {1, 2, ..., n}.at n=26A187493
- Wiener index of a benzenoid consisting of a double-step zig-zag chain of n hexagons (n >= 2, s = 2123; see the Gutman et al. reference).at n=12A193395
- Number of nonisomorphic quantum contextual connected graphs on n nodes.at n=4A221147
- Number of length n+2 0..n arrays with no three equal elements in a row and new values 0..n introduced in 0..n order.at n=6A242467
- Number of length n+2 0..7 arrays with no three equal elements in a row and new values 0..7 introduced in 0..7 order.at n=6A242470
- The growth series for the affine Weyl group F_4.at n=32A266784
- a(n) is the number of permutations of length n that avoid the pattern 321 and the mesh pattern (12, 343) or the same sequence for the mesh patterns (12, 349), (12, 373), (12, 469).at n=10A289611
- a(n) = ceiling(sqrt(2*a(n-1)*a(n-2))), a(1) = a(2) = 1.at n=40A318053
- Number of dessins d'enfants D(n,g) with n edges of genus g, read by rows.at n=17A380453