13631
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 13992
- Proper Divisor Sum (Aliquot Sum)
- 361
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 13272
- Möbius Function
- 1
- Radical
- 13631
- 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
- 182
- 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
- Palindromic Super-2 Numbers.at n=22A032750
- Palindromic Fibonacci-lucky numbers.at n=49A039674
- Concatenation of triangular numbers in increasing order up to the n-th and then in decreasing order.at n=2A066621
- Consider sequence of fractions A066657/A066658 produced by ratios of terms in A066720; let m = smallest integer such that all fractions 1/n, 2/n, ..., (n-1)/n have appeared when we reach A066720(m) = k; sequence gives values of m; set a(n) = -1 if some fraction i/n never appears.at n=20A066849
- Successive left concatenation of floor(k/2) beginning with n until we reach 1.at n=12A068657
- Numbers n for which there are exactly four k such that n = k + reverse(k).at n=31A072428
- Semiprimes in A033951.at n=18A113691
- Palindromic composites such that some digit permutation is prime.at n=31A119378
- Row sums of triangle A134349.at n=8A134350
- Numbers k such that A145768(k) is a square.at n=32A145827
- Numbers k such that prime(k-1) + 7 is square and equal to prime(k+1) - 1.at n=4A158470
- Palindromic mountain numbers.at n=18A173070
- Numbers that are the product of two distinct primes a and b, such that a^3+b^3 is the average of a twin prime pair.at n=39A176876
- Number of arrangements of 3 nonzero numbers x(i) in -n..n with the sum of div(x(i),x(i+1)), where div(a,b)=a/b produces the integer quotient implying a nonnegative remainder, equal to zero.at n=23A190072
- Constant term in the reduction of the polynomial x^(2*n) + x^n + 1 by x^3 -> x + 1. See Comments.at n=20A192812
- a(n) = n*(15*n-11)/2.at n=43A226489
- Palindromic in bases 10 and 24.at n=22A250409
- Palindromes with no palindromic aliquot parts except 1.at n=11A257973
- Palindromes that are not of the form x^2 + y^2 + z^2 where x, y, z are integers.at n=44A272864
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 613", based on the 5-celled von Neumann neighborhood.at n=22A273243