12691
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 15200
- Proper Divisor Sum (Aliquot Sum)
- 2509
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10584
- Möbius Function
- 0
- Radical
- 259
- Omega Function (Ω)
- 4
- 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
- 81
- 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
- Centered cube numbers: n^3 + (n+1)^3.at n=18A005898
- Numbers k such that the continued fraction for sqrt(k) has period 88.at n=36A020427
- "AGJ" (ordered, elements, labeled) transform of 1,2,3,4,...at n=7A032016
- Gaps of 7 in sequence A038593 (lower terms).at n=33A038653
- Numbers ending with '1' that are the difference of two positive cubes.at n=41A038856
- Numbers that are the sum of two (possibly negative) cubes in at least 2 ways.at n=38A051347
- 21-gonal numbers: a(n) = n*(19n - 17)/2.at n=37A051873
- Numbers k such that k | 5^k + 4^k + 3^k + 2^k.at n=19A057249
- Numbers which are the sum of two positive cubes and divisible by 37.at n=13A102618
- Numbers n such that n and its digit reversal R(n) both are difference of positive cubes.at n=19A109879
- Number of n X n binary arrays with rows and columns, considered as binary numbers, in nondecreasing order, and all main diagonal and antidiagonal elements zero.at n=6A162035
- Numbers k which are concatenations k=x//y such that x^2 + y^2 - x*y = k.at n=23A162556
- Triangle read by rows in which row n lists n+1 terms, starting with n^4 and ending with n^5, such that the difference between successive terms is equal to n^4 - n^3.at n=33A163284
- Numbers having exactly four representations by the quadratic form x^2+xy+y^2 with 0<=x<=y.at n=36A198775
- Number of (w,x,y) with all terms in {0,...,n} and max(w,x,y) < 2*min(w,x,y).at n=37A213389
- Numbers that are both a sum and a difference of two positive cubes.at n=28A225908
- Difference between 10^n and the first prime of gap 6 > 10^n.at n=43A227435
- Number of ballot sequences of length n having largest descent 10.at n=4A244206
- Row sums of the triangular array A246694.at n=36A246695
- Numbers k such that 7*R_k - 60 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=18A256801