2913
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3888
- Proper Divisor Sum (Aliquot Sum)
- 975
- 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
- 1940
- Möbius Function
- 1
- Radical
- 2913
- 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
- 110
- 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
- Numbers k such that sigma(k+2) = sigma(k).at n=10A007373
- a(n) = floor(n*(n-1)*(n-2)/16).at n=37A011898
- Expansion of 1/(1-x^5-x^6-x^7-x^8).at n=45A017839
- a(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 1.at n=24A025005
- Sum{T(n-k,k)}, 0<=k<=[ n/2 ], where T is the array in A026374.at n=15A026385
- Inverse binomial transform of {1, primes}.at n=13A030016
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 34.at n=33A031532
- Lucky numbers with size of gaps equal to 8 (upper terms).at n=33A031891
- Lucky numbers with size of gaps equal to 10 (lower terms).at n=31A031892
- Numbers whose set of base-7 digits is {1,3}.at n=36A032914
- a(n) = T(3,n), array T given by A048471.at n=6A036543
- Coordination sequence T3 for Zeolite Code AWO.at n=37A038405
- Coordination sequence T2 for Zeolite Code AWO.at n=37A038407
- Numbers n such that string 1,3 occurs in the base 10 representation of n but not of n-1.at n=32A044345
- Numbers n such that string 1,3 occurs in the base 10 representation of n but not of n+1.at n=32A044726
- Becomes prime after exactly 6 iterations of f(x) = sum of prime factors of x.at n=24A047825
- Array T read by diagonals: T(k,n) = 2^(k-1) * (3^n - 1) + 1.at n=48A048471
- Number of points of norm^2 <= n^2 in the square lattice that are visible from the origin.at n=39A059743
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 61 ).at n=19A063334
- a(n) = A064842(n)/2.at n=25A064843