3231
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 9
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 4680
- Proper Divisor Sum (Aliquot Sum)
- 1449
- 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
- 2148
- Möbius Function
- 0
- Radical
- 1077
- Omega Function (Ω)
- 3
- 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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 167
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- Squares written in base 5.at n=21A001740
- Number of 2n-step polygons on honeycomb.at n=13A006774
- a(n) = floor( a(n-1)/a(1) + a(n-3)/a(3) + a(n-5)/a(5) + ... ), for n >= 3 with a(1) = 1 and a(2) = 3.at n=29A022877
- Numbers k such that Fibonacci(k) == 34 (mod k).at n=27A023180
- n written in fractional base 7/3.at n=57A024640
- Coordination sequence T3 for Zeolite Code ITE.at n=39A027371
- a(n) = a(n-1) + a(floor(n/2)), a(1) = 1.at n=44A033485
- The summarize Fibonacci sequence: summarize the previous two terms!.at n=4A036059
- Number of n-dimensional partitions of 6.at n=8A042984
- Numbers k such that the string 3,8 occurs in the base 9 representation of k but not of k-1.at n=44A044286
- Numbers k such that the string 8,0 occurs in the base 9 representation of k but not of k-1.at n=43A044323
- Numbers n such that string 3,1 occurs in the base 10 representation of n but not of n-1.at n=35A044363
- Numbers n such that string 3,1 occurs in the base 10 representation of n but not of n+1.at n=35A044744
- Numbers whose base-5 representation contains exactly two 0's and three 1's.at n=14A045168
- 23-gonal numbers: a(n) = n(21n-19)/2.at n=18A051875
- Shifts left under transform in formula line.at n=41A052336
- Number of points in N^n of norm <= 2.at n=17A055417
- Positive numbers whose product of digits is twice the sum of the digits.at n=43A062034
- Numbers n such that phi(3n+1) = sigma(n).at n=32A067233
- Numbers k such that sigma(k) = phi(k*bigomega(k)+1).at n=26A067876