6161
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6324
- Proper Divisor Sum (Aliquot Sum)
- 163
- 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
- 6000
- Möbius Function
- 1
- Radical
- 6161
- 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
- 36
- 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
- Somos-5 sequence: a(n) = (a(n-1) * a(n-4) + a(n-2) * a(n-3)) / a(n-5), with a(0) = a(1) = a(2) = a(3) = a(4) = 1.at n=13A006721
- Pseudoprimes to base 41.at n=39A020169
- Pseudoprimes to base 60.at n=18A020188
- Pseudoprimes to base 62.at n=41A020190
- Pseudoprimes to base 69.at n=27A020197
- Pseudoprimes to base 84.at n=17A020212
- Pseudoprimes to base 95.at n=25A020223
- Strong pseudoprimes to base 69.at n=11A020295
- Strong pseudoprimes to base 95.at n=4A020321
- Numbers k such that the continued fraction for sqrt(k) has period 43.at n=14A020382
- a(n) = diagonal sum of left-justified array T given by A027052.at n=25A027069
- Number of rooted trees where root has degree 4.at n=10A029855
- Sort then Add, a(1)=29.at n=10A033904
- Partial sums of primes congruent to 1 mod 6.at n=34A038349
- Smallest k>1 such that k(p-1)-1 is divisible by p^2, p=n-th prime.at n=21A039914
- Denominators of continued fraction convergents to sqrt(95).at n=9A041171
- Denominators of continued fraction convergents to sqrt(861).at n=8A042663
- Numbers whose consecutive digits differ by 5.at n=33A048407
- Number of connected triangle-free planar graphs with n nodes.at n=9A049368
- a(n) = n^4/2 - n^3 + 3*n^2/2 - n + 1 = (n^2 + 1)*(n^2 - 2*n + 2)/2.at n=11A058919