2656
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
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 5292
- Proper Divisor Sum (Aliquot Sum)
- 2636
- 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
- 1312
- Möbius Function
- 0
- Radical
- 166
- Omega Function (Ω)
- 6
- 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
- 115
- 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
- yes
- Odd
- no
Appears in sequences
- Cluster series for bond percolation problem on honeycomb.at n=12A003199
- Number of Skolem sequences of order n.at n=8A004075
- Weighted count of partitions with distinct parts.at n=26A005895
- Coordination sequence T7 for Zeolite Code MFS.at n=32A008179
- Coordination sequence T4 for Zeolite Code STI.at n=35A008237
- a(n) = floor(binomial(n,4)/4).at n=24A011850
- a(n) = floor(n*(n-1)*(n-2)/4).at n=23A011886
- Numbers k giving rise to prime quadruples (30k+11, 30k+13, 30k+17, 30k+19).at n=31A014561
- Numbers k such that phi(k) + 11 | sigma(k).at n=9A015804
- Numbers k such that the continued fraction for sqrt(k) has period 44.at n=18A020383
- Numbers that are the sum of 4 nonzero squares in exactly 6 ways.at n=41A025362
- 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 25.at n=14A031523
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 20 ones.at n=42A031788
- Numbers k such that 117*2^k+1 is prime.at n=15A032408
- Numbers whose set of base-5 digits is {1,4}.at n=46A032817
- Decimal part of a(n)^(1/10) starts with n (10th powers excluded).at n=20A034065
- a(0)=2; a(n) is the smallest k > a(n-1) such that the fractional part of k^(1/10) starts with n.at n=20A034075
- Decimal part of a(n)^(1/10) starts with reversal of its integer part: first term of runs.at n=1A034316
- Maximal base 5 run length is 4.at n=29A037983
- Number of cubefree self avoiding walks in 2 dimensions of length n.at n=8A038592