3519
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 5616
- Proper Divisor Sum (Aliquot Sum)
- 2097
- 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
- 2112
- Möbius Function
- 0
- Radical
- 1173
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- 79
- 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
- Number of partitions of n into partition numbers.at n=45A007279
- Coordination sequence T4 for Zeolite Code AFO.at n=39A008018
- Coordination sequence T3 for Zeolite Code MEL.at n=38A008152
- Expansion of Product_{k>=1} (1 - x^k)^18.at n=10A010824
- Coordination sequence T3 for Zeolite Code MWW.at n=39A024988
- Numbers whose base-4 representation has 4 fewer 0's than 3's.at n=33A031469
- Number of series-reduced planted compound windmills with n leaves.at n=9A032203
- Sums of 10 distinct powers of 2.at n=23A038461
- Numbers n such that string 5,1 occurs in the base 10 representation of n but not of n+1.at n=38A044764
- Numbers having, in base 15, (sum of even run lengths)=(sum of odd run lengths).at n=22A044886
- Numbers whose base-4 representation contains no 0's and exactly four 3's.at n=32A045065
- Numbers whose base-4 representation contains exactly one 1 and four 3's.at n=25A045118
- Numbers whose base-4 representation contains exactly one 2 and four 3's.at n=24A045142
- a(n) = a(n-1) + a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 3, and a(3) = 1.at n=39A050057
- Triangle formed by right-bounded rhombus rule, read by rows.at n=52A059397
- Multiples of 9 containing only odd digits.at n=38A061817
- Write 1, 2, 3, 4, ... counterclockwise in a hexagonal spiral around 0 starting left down, then a(n) is the sequence found by reading from 0 in the vertical upward direction.at n=17A063436
- Number of elements of order 2 in GL(2,Z_n).at n=43A066947
- Number of octagonal regions in regular n-gon with all diagonals drawn.at n=61A067155
- Numbers n such that phi(n)^2 + sigma(n)^2 is an integer square.at n=42A067811