5069
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5244
- Proper Divisor Sum (Aliquot Sum)
- 175
- 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
- 4896
- Möbius Function
- 1
- Radical
- 5069
- 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
- 33
- 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
- Number of Twopins positions.at n=14A005682
- Number of squarefree graphs on n vertices.at n=9A006786
- a(n) = T(2n-1, n-1), T given by A026536.at n=7A026545
- a(n) = T(n, floor(n/2)), T given by A026536.at n=15A026547
- Graham-Sloane-type lower bound on the size of a ternary (n,3,8) constant-weight code.at n=4A030508
- Number of partitions satisfying cn(2,5) + cn(3,5) <= cn(0,5).at n=38A039861
- Denominators of continued fraction convergents to sqrt(194).at n=6A041361
- Numbers n such that 99*2^n-1 is prime.at n=25A050575
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 8.at n=27A051973
- a(0) = 1; a(n) = Sum_{0 <= k < n and gcd(k, n) != 1} a(k).at n=27A054251
- Row sums of the triangle in A122820.at n=36A077388
- Composite numbers k such that the continued fraction for k/m contains no 2 for any 1 <= m <= k.at n=15A082409
- A077388 sorted and duplicates removed.at n=34A082638
- Expansion of (1+t^3)^2/((1-t)*(1-t^2)^2*(1-t^4)).at n=48A106607
- The largest part summed over all partitions of n in which every integer from the smallest part to the largest part occurs.at n=37A117469
- Number of base 29 circular n-digit numbers with adjacent digits differing by 8 or less.at n=3A125464
- Triangle read by rows: T(n,k) = A007318(n-1, k-1) + A001263(n, k) - 1.at n=58A132789
- Triangle read by rows: T(n,k) = A007318(n-1, k-1) + A001263(n, k) - 1.at n=62A132789
- Smallest sum of n consecutive odd primes which is a multiple of n.at n=36A132810
- Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-00001 pattern in any orientation.at n=15A147073