5139
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 7436
- Proper Divisor Sum (Aliquot Sum)
- 2297
- 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
- 3420
- Möbius Function
- 0
- Radical
- 1713
- 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
- 54
- 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
- Numbers k such that the continued fraction for sqrt(k) has period 46.at n=41A020385
- dot_product(n,n-1,...2,1)*(6,7,...,n,1,2,3,4,5).at n=21A026063
- 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 71.at n=8A031569
- Numbers k such that 195*2^k-1 is prime.at n=45A050849
- Number of points in N^5 of norm <= n.at n=7A055404
- Number of points in N^n of norm <= 7.at n=5A055422
- Numbers k such that k | 5^k + 4^k + 3^k + 2^k + 1^k.at n=32A056741
- Nearest integer to log(n)^sqrt(n).at n=41A062464
- Numbers k such that the concatenation of odd numbers from 1 to k is a prime.at n=5A066811
- Let b(1)=b(2)=1, b(k) = (2^b(k-1)+2^b(k-2)) (mod k); sequence gives values of n such that b(n)=0.at n=29A074782
- Antidiagonal sums of square array A082011 divided by the number of the antidiagonal.at n=36A082015
- a(n) = floor(9^n/7^n).at n=34A094991
- Lucky numbers for which the product of the digits is also a lucky number.at n=40A118556
- a(n) = 9*a(n-1) - 6*a(n-2), with a(0)=0, a(1)=1.at n=5A190983
- a(n) = 1 + (n-1) + (n-1)*[n/2-1] + (n-1)*[n/2-1]*[n/3-1] + (n-1)*[n/2-1]*[n/3-1]*[n/4-1] +... for n>0 with a(0)=1, where [x] = floor(x).at n=15A207643
- Number of nX5 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically.at n=3A208417
- T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically.at n=31A208420
- Number of 4 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically.at n=4A208421
- Triangle of coefficients of polynomials v(n,x) jointly generated with A210799; see the Formula section.at n=50A210800
- Number of 2 X 2 matrices having all terms in {1,...,n} and nonnegative determinant.at n=9A211058