16481
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 16482
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 16480
- Möbius Function
- -1
- Radical
- 16481
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 97
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1910
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Coefficients of modular function denoted G_6(tau) by Atkin.at n=20A005764
- a(n) = 11 a(n-1) + 5 a(n-2).at n=5A015597
- Primes that remain prime through 3 iterations of function f(x) = 3x + 8.at n=15A023279
- Primes that are palindromic in base 9.at n=34A029977
- Numbers k such that 239*2^k+1 is prime.at n=23A032496
- Numbers whose base-4 representation contains exactly four 0's and three 1's.at n=29A045036
- Primes resulting from procedure described in A048388.at n=29A048389
- Numerator of Sum_{k=0..n} (-1)^k/k!.at n=10A053557
- Primes p for which the period of reciprocal = (p-1)/8.at n=26A056213
- Consider 3 X 3 X 3 Rubik cube, but consider only positions of edges; sequence gives number of positions that are exactly n moves from the start up to equivalence under the full group of order 48 of the cube.at n=6A080631
- Primes p equal to the sum of two successive sexy primes + 1 such that p + 6 is also prime.at n=28A104043
- Start with 1 and repeatedly reverse the digits and add 65 to get the next term.at n=32A118163
- Primes congruent to 31 mod 47.at n=40A142382
- Primes congruent to 51 mod 53.at n=37A142581
- Primes congruent to 20 mod 59.at n=34A142747
- Primes congruent to 11 mod 61.at n=34A142809
- Ulam's spiral (WSW spoke).at n=32A143854
- Largest prime factor in the subfactorial of n.at n=7A152024
- Primes p0 such that p0+p1+p2-+2 are primes; p0,p1,p2 are three consecutive primes.at n=17A158351
- Numerator of n!*Sum((-1)^k/k!, k=0..n)/(n-1)^n.at n=8A178453