6869
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 29
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 6870
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 6868
- Möbius Function
- -1
- Radical
- 6869
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 106
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 884
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of ordered triples of integers from [ 2,n ] with no global factor.at n=35A015633
- Numbers k such that the continued fraction for sqrt(k) has period 27.at n=29A020366
- Primes p such that 666p is palindromic.at n=5A030095
- Primes formed by concatenating n with n+1.at n=9A030458
- Pair up the numbers.at n=34A030656
- Primes that do not contain any other prime as a proper substring.at n=41A033274
- Primes whose consecutive digits differ by 2 or 3.at n=41A048414
- Recip transform of 2*(1 + x^3 + x^4)-1/(1-x).at n=8A049154
- Primes whose digits are composite; primes having only {4, 6, 8, 9} as digits.at n=10A051416
- Primes whose decimal expansion is a concatenation of two or more consecutive increasing numbers (no leading zeros allowed).at n=10A052087
- Primes having only {0, 6, 8, 9} as digits.at n=4A053580
- Primes p such that p^6 reversed is also prime.at n=31A059699
- Primes having only 0,4,6,8,9 as digits.at n=17A061372
- Arithmetic mean of first n terms of A001414 is an integer.at n=9A065131
- Define the composite field of a prime q to be f(q) = (t,s) if p, q, r are three consecutive primes and q-p = t and r-q = s. This is a sequence of primes q with field (6,2).at n=36A073651
- Prime numbers using only the curved digits 0, 3, 6, 8 and 9.at n=25A079652
- Balanced primes of order three.at n=40A082078
- Let S = 123456789101112131415..., the concatenation of the natural numbers; partition this string into distinct squarefree numbers. To avoid leading zeros, no number may end at the digit that comes before a 0 in S.at n=46A085943
- Primes in which no digit is coprime to its neighbors.at n=20A088297
- a(n) is the lesser term of the smallest twin prime pair such that if P=(a(n)^2+n)^2+n, then P and P+2 are also twin primes. a(n) is 0 if no such pair exists.at n=13A093245