6119
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6360
- Proper Divisor Sum (Aliquot Sum)
- 241
- 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
- 5880
- Möbius Function
- 1
- Radical
- 6119
- 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
- 62
- 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
- Strobogrammatic numbers: the same upside down.at n=25A000787
- Centered cube numbers: n^3 + (n+1)^3.at n=14A005898
- Pseudoprimes to base 63.at n=21A020191
- Pseudoprimes to base 67.at n=43A020195
- Pseudoprimes to base 88.at n=31A020216
- Strong pseudoprimes to base 63.at n=12A020289
- Strong pseudoprimes to base 67.at n=7A020293
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 17 ones.at n=3A031785
- a(1) = 1, a(n) = 2*a(n-1) + a([n/2]).at n=11A033489
- Numbers whose base-5 representation contains exactly two 3's and three 4's.at n=15A045303
- a(n) = (F(6*n+5) - F(6*n+1))/4 = (F(6*n+4) + F(6*n+2))/4, where F = A000045.at n=3A049629
- a(n) = 3*(2^n-1) - 2*n.at n=11A050488
- Numbers that are unchanged when turned upside down, when written in a font in which 7 looks like upside-down 2.at n=42A051791
- 17-gonal (or heptadecagonal) numbers: a(n) = n*(15*n-13)/2.at n=29A051869
- Numbers k such that 7*10^k + 1 is prime.at n=16A056804
- Birthday set of order 9: i.e., numbers congruent to +- 1 modulo 2, 3, 4, 5, 6, 7, 8 and 9.at n=39A057541
- Numbers k such that A055079(k) = 2^k.at n=18A057838
- Semiprimes p1*p2 such that p2 > p1 and p2 mod p1 = 8.at n=35A064906
- Numbers k such that Euler phi(k) / Carmichael lambda(k) = 14.at n=12A066696
- Sum_{k<=n} (sigma(k)^2), where sigma(k) denotes the sum of the divisors of k A000203.at n=17A072379