6481
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 6482
- 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
- 6480
- Möbius Function
- -1
- Radical
- 6481
- 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
- 168
- 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
- 841
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- From a Goldbach conjecture: records in A185091.at n=40A002092
- Primes of form k^2 + k + 1.at n=28A002383
- Largest prime factor of 9^n + 1.at n=6A002592
- Sextan primes: p = (x^6 + y^6)/(x^2 + y^2).at n=16A002647
- Duodecimal primes: p = (x^12 + y^12 )/(x^4 + y^4 ).at n=2A006687
- Primes p == 1 (mod 8), p = a^2 +64*b^2 such that y^2 = x^3 + p*x has rank 0.at n=29A007765
- a(n) = prime(n^2).at n=28A011757
- Cyclotomic polynomials at x=3.at n=24A019321
- Cyclotomic polynomials at x=9.at n=12A019327
- Numbers k such that the continued fraction for sqrt(k) has period 13.at n=35A020352
- Cyclotomic polynomials at x=-3.at n=24A020502
- Cyclotomic polynomials at x=-9.at n=12A020508
- a(n)/1000 gives sqrt(n) to 3 places after the decimal point.at n=41A027662
- 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 17.at n=2A031605
- Numbers k such that 183*2^k+1 is prime.at n=26A032468
- Take list of cubes, move left digit of each term to end of previous term.at n=23A032761
- Primes that do not contain any other prime as a proper substring.at n=40A033274
- Least k such that A033178(k)=n.at n=41A038004
- Numerators of continued fraction convergents to sqrt(223).at n=4A041416
- Numerators of continued fraction convergents to sqrt(892).at n=4A042724