3261
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4352
- Proper Divisor Sum (Aliquot Sum)
- 1091
- 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
- 2172
- Möbius Function
- 1
- Radical
- 3261
- 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
- 136
- 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
- Coordination sequence T4 for Zeolite Code EMT.at n=47A008089
- a(n) = floor(log(5)^n).at n=17A014216
- Numbers k giving rise to prime quadruples (30k+11, 30k+13, 30k+17, 30k+19).at n=35A014561
- Coordination sequence T8 for Zeolite Code MWW.at n=38A024993
- Number of partitions of n into an odd number of parts, the greatest being 6; also, a(n+11) = number of partitions of n+5 into an even number of parts, each <=6.at n=51A026926
- 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 38.at n=15A031536
- Coordination sequence T4 for Zeolite Code SBE.at n=46A033607
- Positive numbers having the same set of digits in base 7 and base 10.at n=21A037440
- Coordination sequence Z12 for Zeolite Code STT.at n=38A038416
- Number of partitions satisfying cn(1,5) < cn(2,5) + cn(3,5) and cn(4,5) < cn(2,5) + cn(3,5).at n=31A039888
- Numbers whose base-5 representation has exactly 6 runs.at n=5A043606
- Numbers n such that string 6,1 occurs in the base 10 representation of n but not of n-1.at n=35A044393
- Numbers n such that string 6,1 occurs in the base 10 representation of n but not of n+1.at n=35A044774
- Numbers whose base-5 representation contains exactly two 0's and three 1's.at n=18A045168
- a(1) = 8; a(n) is smallest number >= a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime.at n=29A046258
- Internal digits of n^2 include digits of n.at n=46A046832
- Internal digits of n^2 include digits of n, n does not end in 0.at n=32A046833
- Becomes prime or 4 after exactly 7 iterations of f(x) = sum of prime factors of x.at n=37A048129
- Numbers n such that 219*2^n-1 is prime.at n=7A050861
- Concatenation of n in base 10 down up to base 2 is prime, all numbers are interpreted as decimals.at n=31A054257