6469
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 6470
- 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
- 6468
- Möbius Function
- -1
- Radical
- 6469
- 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
- 49
- 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
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 839
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Real part of (1 + 2*i)^n, where i is sqrt(-1).at n=11A006495
- Primes that divide at least one term of Sylvester's sequence s = A000058: s(n+1) = s(n)^2 - s(n) + 1, s(0) = 2.at n=20A007996
- Numbers k such that the continued fraction for sqrt(k) has period 49.at n=8A020388
- Primes that remain prime through 2 iterations of the function f(x) = 5x + 8.at n=45A023255
- Primes that remain prime through 3 iterations of function f(x) = 7x + 6.at n=12A023290
- Upper prime of a difference of 18 between consecutive primes.at n=23A031937
- Primes that are concatenations of n with n + 5.at n=5A032628
- Exactly 5 digits from {1,2,3,4,5,6,7,8,9} can precede a(n) to form a lucky number.at n=27A032701
- Primes that do not contain any other prime as a proper substring.at n=39A033274
- Numbers having three 7's in base 9.at n=31A043483
- Primes whose consecutive digits differ by 2 or 3.at n=38A048414
- Primes whose digits are composite; primes having only {4, 6, 8, 9} as digits.at n=8A051416
- First term of weak prime quintets: p(m+1)-p(m) < p(m+2)-p(m+1) < p(m+3)-p(m+2) < p(m+4)-p(m+3).at n=16A054823
- Primes p whose period of reciprocal equals (p-1)/7.at n=6A056212
- Primes p such that p^6 reversed is also prime.at n=28A059699
- Primes having only 0,4,6,8,9 as digits.at n=15A061372
- Geometric mean of the digits = 6. In other words, the product of the digits is = 6^k where k is the number of digits.at n=34A061429
- Primes of the form sum 6d/(2 + mu(d)) for some k and all d dividing k.at n=18A069548
- Minimal set of prime-strings in base 10.at n=14A071062
- Primes p such that the number of distinct prime divisors of all composite numbers between p and the next prime is 6.at n=36A075586