4061
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4224
- Proper Divisor Sum (Aliquot Sum)
- 163
- 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
- 3900
- Möbius Function
- 1
- Radical
- 4061
- 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
- 38
- 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
- Crystal ball sequence for hexagonal close-packing.at n=10A007202
- Coordination sequence T1 for Zeolite Code AEL.at n=42A008004
- Coordination sequence T2 for Zeolite Code AEL.at n=42A008005
- Coordination sequence T1 for Zeolite Code MOR.at n=41A008182
- Pseudoprimes to base 58.at n=24A020186
- Pseudoprimes to base 61.at n=35A020189
- Pseudoprimes to base 70.at n=23A020198
- Pseudoprimes to base 78.at n=17A020206
- Pseudoprimes to base 89.at n=43A020217
- Numbers k such that the continued fraction for sqrt(k) has period 54.at n=13A020393
- The sequence M(n) in A022905.at n=22A022908
- a(n) = sum of the numbers between the two n's in A026358.at n=32A026361
- a(n) = Sum_{d|n} sigma(n/d)*d^3.at n=14A027847
- Denominators of continued fraction convergents to sqrt(875).at n=15A042691
- a(n)=(s(n)+6)/10, where s(n)=n-th base 10 palindrome that starts with 4.at n=28A043083
- Numbers whose base-4 representation contains exactly two 1's and four 3's.at n=13A045123
- Numbers whose base-5 representation contains exactly three 1's and three 2's.at n=3A045232
- a(n)=T(n,1), array T as in A049735.at n=36A049744
- a(n) = n*(n^2 - 6*n + 11)/6.at n=31A050407
- Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 18.at n=31A050967