6243
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8328
- Proper Divisor Sum (Aliquot Sum)
- 2085
- 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
- 4160
- Möbius Function
- 1
- Radical
- 6243
- 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
- 62
- 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
- Powers of 3 written in base 7.at n=7A004661
- Least k>1 such that first n terms of Kolakoski sequence A000002 repeat in reverse order beginning at k-th term.at n=38A022295
- a(n) = a(n-1) + a(n-2) + 1, with a(0) = 1 and a(1) = 8.at n=15A022322
- Convolution of A001950 with itself.at n=16A023667
- n written in fractional base 10/6.at n=43A024661
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 79.at n=0A031577
- Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 79.at n=0A031757
- Values of A038005 ending in 3.at n=3A038013
- Numbers whose base-5 representation contains exactly two 3's and three 4's.at n=19A045303
- p^2 + 2 where p is a prime.at n=21A061725
- Square root of coefficients of power series: A083352(x)^2 + A083352(x) - 1; term-by-term square root of A083353.at n=75A083354
- Numerators in expansion of 1/sqrt(1-x-x^2*c(x^2)), c(x) the g.f. of A000108.at n=6A110120
- Beginning with 3, least number such that concatenation of first n terms and its digit reversal both are primes.at n=17A111382
- Terms in A061725 that are of form 3*prime.at n=9A133395
- Sums of prime points found in four grids in each corner of a square.at n=32A161190
- a(n) = 4*n*(n+1) + 3.at n=39A164897
- Members of A167490 sorted in ascending order.at n=40A167491
- Number of distinct solutions of sum{i=1..2}(x(2i-1)*x(2i)) = 0 (mod n), with x() in 0..n-1.at n=32A180794
- Numbers k such that k and k+1 have the same binary XOR of divisors.at n=24A227443
- G.f. satisfies: x = A(x - A(x^2 - A(x^3 - A(x^4 - A(x^5 -...))))).at n=12A228862