2041
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 7
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2212
- Proper Divisor Sum (Aliquot Sum)
- 171
- 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
- 1872
- Möbius Function
- 1
- Radical
- 2041
- 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
- 63
- 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
- Numbers k such that (1,k) is "good".at n=24A000696
- a(n) = floor( tan(n)^2 ).at n=55A005657
- Number of n-node connected graphs with at most one cycle.at n=11A005703
- a(n) = Sum_{k=1..n-1} lcm(k,n-k).at n=26A006580
- Expansion of layer susceptibility series for square lattice.at n=8A007288
- Hyperperfect numbers: k = m*(sigma(k) - k - 1) + 1 for some m > 1.at n=6A007592
- Coordination sequence T2 for Zeolite Code EUO.at n=28A008097
- Coordination sequence T4 for Zeolite Code EUO.at n=28A008099
- Coordination sequence T3 for Zeolite Code MFS.at n=28A008175
- Coordination sequence T4 for Zeolite Code -PAR.at n=32A009858
- Positive integers k such that k divides 14^k - 1.at n=3A014956
- Pseudoprimes to base 12.at n=16A020140
- Pseudoprimes to base 22.at n=20A020150
- Pseudoprimes to base 28.at n=17A020156
- Pseudoprimes to base 50.at n=22A020178
- Strong pseudoprimes to base 28.at n=6A020254
- Strong pseudoprimes to base 50.at n=5A020276
- Numbers k such that the continued fraction for sqrt(k) has period 36.at n=20A020375
- Place where n-th 1 occurs in A023117.at n=42A022779
- Positive numbers k such that k and 2*k are anagrams in base 8 (written in base 8).at n=6A023073