6539
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 7056
- Proper Divisor Sum (Aliquot Sum)
- 517
- 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
- 6024
- Möbius Function
- 1
- Radical
- 6539
- 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
- 168
- 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 17*2^k + 1 is prime.at n=13A002259
- Exponentiation of e.g.f. for primes.at n=6A007446
- a(n) = Sum_{k=0..n} ceiling(k^3/n).at n=28A014813
- Number of terms in n-th derivative of a function composed with itself 7 times.at n=8A024207
- 3*n^2-2*n+6.at n=47A047915
- Matrix 7th power of partition triangle A008284.at n=28A050301
- Semiprimes p1*p2 such that p2 mod p1 = 9, with p2 > p1.at n=32A064907
- a(1) = 2; a(n) is smallest number > a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime.at n=45A074338
- Consider 3 X 3 X 3 Rubik cube, but consider only positions of corners; sequence gives number of positions that are exactly n moves from the start.at n=4A080630
- Main diagonal of square array A082025.at n=43A082189
- a(n) = ceiling(a(n-1)*4/3), with a(1) = 1.at n=28A087192
- Structured octagonal anti-prism numbers.at n=12A100184
- Numbers k such that the k-th and (k+1)-th primes have the same sum of squares of digits.at n=26A109182
- Number of base 29 n-digit numbers with adjacent digits differing by one or less.at n=6A126383
- Number of 2-sided strip polykites with n cells.at n=12A151530
- Number of binary strings of length n with equal numbers of 000 and 010 substrings.at n=15A164138
- Number of n X 6 binary arrays without the pattern 0 1 diagonally, vertically or antidiagonally.at n=27A188863
- Numbers k such that A057775(k) is the factor of a Fermat number 2^(2^m) + 1 for some m.at n=36A201364
- Number of terms in 8th derivative of a function composed with itself n times.at n=6A215626
- Number of n X 2 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 3 binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order.at n=19A227637