16291
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
- 4
- Divisor Sum
- 17784
- Proper Divisor Sum (Aliquot Sum)
- 1493
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 14800
- Möbius Function
- 1
- Radical
- 16291
- 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
- 159
- 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
- Strong pseudoprimes to base 98.at n=20A020324
- Numbers k such that the continued fraction for sqrt(k) has period 98.at n=35A020437
- Numbers whose base-5 representation has exactly 7 runs.at n=9A043607
- a(n) = (8*(2^n) - n^2 - 3*n - 6)/2.at n=12A048492
- Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which generate a group of order two under binary matrix multiplication.at n=7A054466
- a(n) = (p^2 - p + 2)/2 for p = prime(n); number of squares modulo p^2.at n=41A072205
- Members of A000124 which are multiples of 11.at n=32A083511
- Positive integers of the form (7*m^2+1)/11.at n=29A179370
- a(n) = 8*n^2 + 2*n + 1.at n=45A188135
- Nonprime numbers with all divisors starting and ending with digit 1.at n=30A208261
- Gray code of Fibonacci(n).at n=21A255919
- A linear recurrence related to the elliptic curves y^2 = x^3 -35*a^2*x - 98*a^3 with a = -1, -5, -6, -17, or -111.at n=10A267437
- Numbers k such that 4*10^k - 83 is prime.at n=20A294123
- Numbers n such that n^3 contains the consecutive substring 2,3,5,7.at n=16A295900
- Composite numbers k with its divisors having the property that the last digit of every divisor is the same as the first digit of the next divisor.at n=33A307858
- Number of square multiset partitions of integer partitions of n.at n=30A323531
- Row 2 of A328464: a(n) = A276156(4n - 2) / 2.at n=30A328465
- Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UH, HH, HD and DU.at n=24A329693
- Values of w(k) when w(k-2), w(k-1), and w(k) are all odd, where w is A336957.at n=3A338071