2911
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3024
- Proper Divisor Sum (Aliquot Sum)
- 113
- 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
- 2800
- Möbius Function
- 1
- Radical
- 2911
- 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
- 141
- Smith Number
- yes
- 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 nonnegative solutions to x^2 + y^2 + z^2 <= n^2.at n=17A000604
- a(n) = 4*a(n-1) - a(n-2) with a(0) = 0, a(1) = 1.at n=7A001353
- a(n) = 4*a(n-2) - a(n-4) for n > 1, a(n) = n for n = 0, 1.at n=14A002530
- Number of perfect matchings (or domino tilings) in graph C_{5} X P_{2n}.at n=2A003729
- Certain subgraphs of a directed graph (inverse binomial transform of A005321).at n=4A005014
- Pisot sequence E(4,15): a(n) = floor(a(n-1)^2/a(n-2)+1/2) for n>1, a(0)=4, a(1)=15.at n=5A010905
- Pseudoprimes to base 25.at n=33A020153
- Pseudoprimes to base 57.at n=27A020185
- Pseudoprimes to base 66.at n=15A020194
- Pseudoprimes to base 72.at n=19A020200
- Strong pseudoprimes to base 57.at n=6A020283
- Strong pseudoprimes to base 66.at n=4A020292
- Numbers k such that the continued fraction for sqrt(k) has period 44.at n=23A020383
- a(n) = [ n/{n*sqrt(3)} ], where {x} := x - [ x ].at n=40A024547
- a(n) = Sum_{k = 1..n} k*floor((n + prime(k))/k).at n=32A024929
- Coordination sequence T2 for Zeolite Code ITE.at n=37A027370
- Bisection of A001353. Indices of square numbers which are also octagonal.at n=3A028230
- Sum over all n! permutations of n letters of maximum cycle length.at n=5A028418
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 53.at n=10A031551
- Coordination sequence T4 for Zeolite Code SBS.at n=43A033611