549
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 806
- Proper Divisor Sum (Aliquot Sum)
- 257
- 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
- 360
- Möbius Function
- 0
- Radical
- 183
- 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
- 92
- Smith 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
Names
- German
- fünfhundertneunundvierzig· ordinal: fünfhundertneunundvierzigste
- English
- five hundred forty-nine· ordinal: five hundred forty-ninth
- Spanish
- quinientos cuarenta y nueve· ordinal: 549º
- French
- cinq cent quarante-neuf· ordinal: cinq cent quarante-neufième
- Italian
- cinquecentoquarantanove· ordinal: 549º
- Latin
- quingenti quadraginta novem· ordinal: 549.
- Portuguese
- quinhentos e quarenta e nove· ordinal: 549º
Appears in sequences
- Number of carbon (rooted) trees with n carbon atoms = unordered 4-tuples of ternary trees.at n=10A000678
- Prime numbers of measurement.at n=22A002049
- Mixed partitions of n.at n=19A002096
- Numbers k such that (k^2 + k + 1)/13 is prime.at n=28A002642
- a(n) = floor((n^2 + 6n - 3)/4).at n=43A004116
- a(n) = Sum_t t*F(n,t), where F(n,t) is the number of forests with n (unlabeled) nodes and exactly t trees, all of which are planted (that is, rooted trees in which the root has degree 1).at n=9A005199
- Positions of remoteness 5 in Beans-Don't-Talk.at n=26A005697
- a(n) = Sum_{k=1..n-1} lcm(k,n-k).at n=18A006580
- a(n) = Sum_{k=1..n-1} (k OR n-k).at n=24A006583
- Numbers k such that phi(k) = phi(sigma(k)).at n=23A006872
- Let S denote the palindromes in the language {0,1,2}*; a(n) = number of words of length n in the language SS.at n=7A007056
- Moebius transform of triangular numbers.at n=37A007438
- Coordination sequence T1 for Zeolite Code STI.at n=16A008234
- Coordination sequence T1 for Scapolite.at n=15A008262
- Numbers n such that n^3 and n have same last 2 digits.at n=49A008856
- Coordination sequence T2 for Zeolite Code RSN.at n=15A009886
- a(n) = n^2 + 3*n - 1.at n=22A014209
- Numbers k that divide s(k), where s(1)=1, s(j)=13*s(j-1)+j.at n=11A014861
- Numbers k such that k divides s(k), where s(1)=1, s(j) = s(j-1) + j*13^(j-1).at n=7A014953
- Numbers k such that phi(k) | sigma(k + 3).at n=47A015840