6109
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6300
- Proper Divisor Sum (Aliquot Sum)
- 191
- 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
- 5920
- Möbius Function
- 1
- Radical
- 6109
- 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
- 155
- 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 the continued fraction for sqrt(k) has period 47.at n=12A020386
- a(n) = either 4a(n-1)+1 or 4a(n-1)+3 depending on corresponding term of A005614, +1 for 0, +3 for 1.at n=6A028894
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 31.at n=0A031619
- Numbers k such that 239*2^k+1 is prime.at n=20A032496
- Numbers whose base-4 representation contains exactly four 1's and three 3's.at n=8A045132
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 23.at n=9A051988
- Number of trees with n nodes and 4 leaves.at n=30A055291
- First differences of A066425.at n=11A068054
- Smallest k such that gcd(c(k),k) = gcd(A002808(k),k) = A064814(k) = n.at n=40A073257
- Least nontrivial multiple of the n-th prime beginning with 6.at n=34A078290
- Exponents k such that the sum of decimal digits of 2^k is also a power of 2.at n=16A095412
- A bisection of A000960.at n=43A099062
- a(n) = 6*2^n - 3*n - 5.at n=10A101946
- Semiprimes that are semiprimes turned upside-down.at n=33A119738
- a(n) = 5*n^2 + 20*n + 4.at n=32A134547
- Semiprimes whose factors are decimal palindromes when concatenated, omitting multiples of primes less than 11.at n=19A144719
- Number of permutations of 1..n+5 with the number moved left exceeding the number moved right by n or more.at n=4A179580
- Sum of the numbers already removed (including the target number) in the first jump of a Sieve of Eratosthenes table.at n=19A179654
- Number of 0..n arrays x(0..4) of 5 elements with zero 3rd differences.at n=35A200083
- Number of nX4 0..3 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.at n=4A222496