3291
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
- 4392
- Proper Divisor Sum (Aliquot Sum)
- 1101
- 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
- 2192
- Möbius Function
- 1
- Radical
- 3291
- 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 T2 for Zeolite Code AFS.at n=44A008024
- Coordination sequence T1 for Zeolite Code ATO.at n=38A008265
- Crystal ball sequence for squashed {D_5}^* lattice, perhaps the smallest example of a "non-superficial" lattice.at n=5A010025
- Numbers k such that the continued fraction for sqrt(k) has period 34.at n=40A020373
- Number of partially ordered sets with no isolated points and with n "lines": pairs (a,b) where a < b and there is no c with a < c < b. The lines form the minimal basis for the partial ordering.at n=7A022016
- Convolution of A023531 and Fibonacci numbers.at n=18A023557
- Convolution of A023531 and (F(2), F(3), F(4), ...).at n=17A023561
- Diagonal sum of left justified array T given by A027082.at n=22A027100
- Number of connected functions on n points with a loop of length 3.at n=9A029852
- 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 57.at n=4A031555
- Shifts left twice under "AGK" (ordered, elements, unlabeled) transform.at n=14A032029
- Base 6 digits are, in order, the first n terms of the periodic sequence with initial period 2,3,1.at n=4A037641
- Numbers having four 1's in base 5.at n=28A043356
- Numbers having three 3's in base 8.at n=26A043435
- Numbers k such that the string 5,6 occurs in the base 9 representation of k but not of k-1.at n=44A044302
- Numbers n such that string 9,1 occurs in the base 10 representation of n but not of n-1.at n=35A044423
- Numbers m such that string 9,1 occurs in the base 10 representation of m but not of m+1.at n=35A044804
- First differences are A005563.at n=20A047732
- Number of base-2 strong pseudoprimes (A001262) less than 10^n.at n=9A055552
- Numbers n such that n and prime(n) end with the same two digits.at n=33A067838