3161
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3300
- Proper Divisor Sum (Aliquot Sum)
- 139
- 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
- 3024
- Möbius Function
- 1
- Radical
- 3161
- 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
- 154
- 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 T1 for Zeolite Code AFS.at n=43A008023
- Coordination sequence T4 for Zeolite Code BOG.at n=40A008052
- Coordination sequence T5 for Zeolite Code BOG.at n=40A008053
- Coordination sequence T1 for Zeolite Code AHT.at n=38A009866
- Numbers k such that the continued fraction for sqrt(k) has period 7.at n=25A010338
- Expansion of x/(1 - 7*x - 5*x^2).at n=5A015562
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite RUT = RUB-10 R4[B4Si32O72] starting from a T3 atom.at n=11A019232
- a(n) = least m such that if r and s in {1/1, 1/3, 1/5,..., 1/(2n-1)} satisfy r < s, then r < k/m < s for some integer k.at n=45A024819
- Number of partitions of n into distinct parts >= 3.at n=60A025148
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 22.at n=0A031610
- a(n) = n * prime(n).at n=28A033286
- Square root of smallest square starting with a string of n 9's.at n=2A034994
- Schoenheim bound L_1(n,4,3).at n=39A036831
- Positive numbers having the same set of digits in base 8 and base 10.at n=15A037442
- Denominators of continued fraction convergents to sqrt(178).at n=6A041329
- Denominators of continued fraction convergents to sqrt(712).at n=6A042371
- Numbers n such that string 6,1 occurs in the base 10 representation of n but not of n-1.at n=34A044393
- Numbers n such that string 6,1 occurs in the base 10 representation of n but not of n+1.at n=34A044774
- Numbers whose base-5 representation contains exactly two 0's and three 1's.at n=9A045168
- Coordination sequence T4 for Zeolite Code DON.at n=38A047956