1813
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 2166
- Proper Divisor Sum (Aliquot Sum)
- 353
- 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
- 1512
- Möbius Function
- 0
- Radical
- 259
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 16
- 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 trees of diameter 8.at n=6A000306
- Coordination sequence T4 for Zeolite Code EMT.at n=35A008089
- Coordination sequence T3 for Zeolite Code EPI.at n=27A008092
- Coordination sequence T2 for Zeolite Code FER.at n=26A008107
- Coordination sequence T2 for Zeolite Code GOO.at n=29A008112
- Coordination sequence for sigma-CrFe, Position Xb.at n=11A009960
- Minimal number of people to give a 50% probability of having at least n coincident birthdays in one year.at n=12A014088
- Pseudoprimes to base 31.at n=18A020159
- Pseudoprimes to base 48.at n=15A020176
- Pseudoprimes to base 68.at n=33A020196
- Pseudoprimes to base 80.at n=18A020208
- Pseudoprimes to base 97.at n=37A020225
- Strong pseudoprimes to base 48.at n=4A020274
- Expansion of 1/((1-2x)(1-3x)(1-4x)(1-8x)).at n=3A025467
- (d(n)-r(n))/5, where d = A008778 and r is the periodic sequence with fundamental period (0,3,1,0,1).at n=34A026053
- Sequence satisfies T^2(a)=a, where T is defined below.at n=42A027590
- a(n) = n^2 + n + 7.at n=42A027692
- Numbers whose set of base-6 digits is {1,2}.at n=44A032927
- a(n) = (3*n+1)*(4*n+1).at n=12A033577
- Expansion of sum ( q^n / product( 1-q^k, k=1..6*n), n=0..inf ).at n=20A035298