1325
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
- 6
- Divisor Sum
- 1674
- Proper Divisor Sum (Aliquot Sum)
- 349
- 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
- 1040
- Möbius Function
- 0
- Radical
- 265
- 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
- 26
- Smith Number
- no
- Vampire 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
Appears in sequences
- a(n) = n*(n+3)/2.at n=50A000096
- Number of bipartite partitions of n white objects and 3 black ones.at n=11A000412
- Numbers that are the sum of 2 squares in exactly 3 ways.at n=11A000443
- Boustrophedon transform of primes.at n=6A000747
- Markoff (or Markov) numbers: union of positive integers x, y, z satisfying x^2 + y^2 + z^2 = 3*x*y*z.at n=13A002559
- Numbers k such that 2*10^k - 1 is prime.at n=15A002957
- Centered tetrahedral numbers.at n=12A005894
- Number of points on surface of square pyramid: 3*n^2 + 2 (n>0).at n=21A005918
- a(n) = (5*n + 1)^2 + 4*n + 1.at n=7A007533
- Coordination sequence T2 for Zeolite Code DDR.at n=23A008072
- If a, b in sequence, so is ab+7.at n=16A009312
- Coordination sequence T1 for Zeolite Code RUT.at n=24A009897
- Coordination sequence T3 for Zeolite Code VET.at n=22A009904
- Coordination sequence for FeS2-Marcasite, S position.at n=19A009954
- a(0) = 1, a(n) = 27*n^2 + 2 for n>0.at n=7A010017
- Numbers k such that the continued fraction for sqrt(k) has period 3.at n=8A013643
- a(n) = n*(2*n + 3).at n=25A014106
- Quadruples of different integers from [ 1,n ] with no global factor.at n=14A015622
- Odd numbers k such that d(k) does not divide phi(k).at n=35A015734
- Numerator of sum of -2nd powers of divisors of n.at n=45A017667