13611
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 19600
- Proper Divisor Sum (Aliquot Sum)
- 5989
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8352
- Möbius Function
- -1
- Radical
- 13611
- Omega Function (Ω)
- 3
- 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
- 89
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- a(n) = n*(9*n-2).at n=39A013656
- Collatz-2 (A063041) trajectory starting at 29.at n=5A063044
- Collatz-2 (A063041) trajectory starting at 29.at n=20A063044
- Collatz-2 (A063041) trajectory starting at 29.at n=35A063044
- Number of base 25 n-digit numbers with adjacent digits differing by two or less.at n=5A126412
- a(n) = (p*(p+4)+1)/2 where (p,p+4) are the n-th cousin prime pair.at n=12A163634
- Number of partitions of n such that the multiplicity of the number of parts is a part.at n=48A240499
- Number of partitions n such that the multiplicity of the number of odd parts is a part.at n=43A240541
- In the n-th row of Pascal's triangle, an odious entry is replaced by 1, an evil entry is replaced by 0 and the n-th row is converted to decimal.at n=13A249664
- Number T(n,k) of set partitions of [n] having exactly k triples (t,t+1,t+2) such that t+i is in block b+i for some b; triangle T(n,k), n>=0, 0<=k<=max(0,n-2), read by rows.at n=41A271206
- Numbers k such that k!6 + 16 is prime, where k!6 is the sextuple factorial number (A085158 ).at n=31A288444
- Floor of area of triangle whose sides are consecutive Ulam numbers (A002858).at n=35A330909
- Numbers k whose ordered binary weights (A000120) of their divisors are the numbers 1 to A000005(k).at n=40A354724