2249
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
- 2436
- Proper Divisor Sum (Aliquot Sum)
- 187
- 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
- 2064
- Möbius Function
- 1
- Radical
- 2249
- 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
- 45
- 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
- Number of distinct autocorrelations of binary words of length n.at n=49A005434
- Number of "magic squares" of order n (see comment line for exact definition).at n=6A005650
- Twelve iterations of Reverse and Add are needed to reach a palindrome.at n=2A015993
- a(n+1) (n >= 1) is smallest number > a(n) which is the sum of cubes of distinct earlier terms.at n=45A019511
- Coordination sequence T1 for Zeolite Code SAO.at n=37A019571
- Numbers k such that the continued fraction for sqrt(k) has period 11.at n=22A020350
- Fibonacci sequence beginning 1, 15.at n=12A022105
- [ (3rd elementary symmetric function of 3,4,...,n+4)/(3+4+...+n+4) ].at n=11A024191
- Numbers that are the sum of 4 positive cubes in exactly 3 ways.at n=7A025405
- Numbers that are the sum of 4 positive cubes in 3 or more ways.at n=8A025407
- Numbers that are the sum of 4 distinct positive cubes in exactly 3 ways.at n=1A025410
- Numbers that are the sum of 4 distinct positive cubes in 2 or more ways.at n=29A025412
- Numbers that are the sum of 4 distinct positive cubes in 3 or more ways.at n=1A025413
- Index of 9^n within the sequence of the numbers of the form 2^i*9^j.at n=37A025734
- a(n) = (d(n)-r(n))/5, where d = A026054 and r is the periodic sequence with fundamental period (3,3,0,0,4).at n=35A026056
- a(n) = sum of the numbers between the two n's in A026350.at n=44A026353
- Number of distinct products ijk with 0 <= i,j,k <= n.at n=31A027426
- Numbers whose base-5 representation has 3 fewer 0's than 4's.at n=38A031476
- Numbers k such that 219*2^k+1 is prime.at n=25A032486
- Decimal part of cube root of a(n) starts with 1: first term of runs.at n=11A034127