5619
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 7496
- Proper Divisor Sum (Aliquot Sum)
- 1877
- 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
- 3744
- Möbius Function
- 1
- Radical
- 5619
- 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
- 160
- 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 that are the sum of 5 positive 6th powers.at n=31A003361
- Quadruples of different integers from [ 2,n ] with no global factor.at n=20A015627
- 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 23.at n=31A031521
- Denominators of continued fraction convergents to sqrt(274).at n=9A041515
- Numerators of continued fraction convergents to sqrt(526).at n=5A042006
- Numbers whose base-5 representation contains exactly two 3's and three 4's.at n=12A045303
- T(2n,n), array T as in A047100.at n=6A047109
- Next-to-smallest k such that 2^(2^n) - k is prime.at n=12A058221
- C(n+3)=2*C(n), where C(n) is Cototient(n) := n - phi(n) (A051953).at n=34A063480
- Least m such that P - m is prime, where P is the n-th perfect number.at n=24A078097
- Number of symmetric short bushes with n edges.at n=22A082958
- Number of binary necklaces of length n with no subsequence 000.at n=18A093305
- a(n) = (1/6)*(n^3 + 21*n^2 + 74*n + 18).at n=26A103145
- Semiprimes of the form 2*n + 1, where n is a square.at n=21A111351
- Smallest k > 0 such that abs(S(k)P(k)-k) equals n, where S(k) is the sum and P(k) is the product of decimal digits of k or 0 if no such k exists.at n=51A114457
- Numbers whose square is the concatenation of two numbers k and k+4.at n=7A115438
- Numbers k such that the digits of k^3, reversed, include the digits of k as substring.at n=12A115762
- Expansion of x * (x+1) * (x^3-x^2-1) / ((x^2+1) * (x^3+x^2-1)).at n=33A122519
- Numbers n such that n^k+(n+1)^k is prime for k = 1, 2, 4.at n=31A128780
- Numbers k that divide 3^((k-1)/2) - 2^((k-1)/2) - 1.at n=41A130061