1189
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1260
- Proper Divisor Sum (Aliquot Sum)
- 71
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1120
- Möbius Function
- 1
- Radical
- 1189
- 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
- 75
- 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
- Flavius Josephus's sieve: Start with the natural numbers; at the k-th sieving step, remove every (k+1)-st term of the sequence remaining after the (k-1)-st sieving step; iterate.at n=38A000960
- a(n)^2 is a triangular number: a(n) = 6*a(n-1) - a(n-2) with a(0)=0, a(1)=1.at n=5A001109
- Triangle of values of 2-d recurrence.at n=55A001404
- a(n) = 2*a(n-1) + 5*a(n-2), a(0) = 0, a(1) = 1.at n=7A002532
- Number of bipartite partitions.at n=7A002765
- Number of coprime chains with largest member n.at n=66A003139
- Number of coprime chains with largest member prime(n).at n=18A003140
- Number of perfect matchings (or domino tilings) in W_5 X P_2n.at n=1A003735
- a(n) = 3*a(n-1) + a(n-2), with a(0)=0, a(1)=1.at n=7A006190
- Number of n-step spirals on hexagonal lattice.at n=13A006777
- Number of elements (a b, c d) in GL(2,Z) with |det| = 1, trace <= n and 0 <= a <= {b, c} <= d.at n=52A007295
- Number of strict 5th-order maximal independent sets in cycle graph.at n=40A007393
- Coordination sequence T1 for Zeolite Code GME and AFX.at n=26A008110
- Composite but smallest prime factor >= 17.at n=36A008367
- Coordination sequence for sigma-CrFe, Position Xd.at n=9A009959
- Terms in perturbation solution of a heat transfer problem.at n=8A013704
- Number of trees on n nodes with forbidden limbs.at n=7A014271
- Powers of fifth root of 5 rounded down.at n=22A018126
- Numbers k such that the continued fraction for sqrt(k) has period 25.at n=4A020364
- Pisot sequences E(3,10), P(3,10).at n=5A020704