16541
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 20160
- Proper Divisor Sum (Aliquot Sum)
- 3619
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 13248
- Möbius Function
- -1
- Radical
- 16541
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 97
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Numbers k such that 2^k + 5 is prime.at n=11A059242
- Engel expansion of exp(2).at n=15A068375
- a(n) = a(n-1)+a(n-2)-a(n-3)+a(n-5), n>7.at n=29A107287
- Number of length-n 0..6 arrays with no repeated value differing from the previous repeated value by plus or minus one modulo 6+1.at n=4A269688
- T(n,k)=Number of length-n 0..k arrays with no repeated value differing from the previous repeated value by plus or minus one modulo k+1.at n=49A269690
- Number of length-5 0..n arrays with no repeated value differing from the previous repeated value by plus or minus one modulo n+1.at n=5A269691
- Triangle read by rows: coefficients of the polynomial (Sum_{i=0..k} (Product_{j=0..i} (x+j)))/(x*(x+2)).at n=51A270250
- Numbers k such that 9*10^k + 19 is prime.at n=26A272622
- Number of nX4 0..1 arrays with each 1 adjacent to 0, 2 or 3 king-move neighboring 1s.at n=4A296670
- Number of nX5 0..1 arrays with each 1 adjacent to 0, 2 or 3 king-move neighboring 1s.at n=3A296671
- T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 0, 2 or 3 king-move neighboring 1s.at n=31A296674
- T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 0, 2 or 3 king-move neighboring 1s.at n=32A296674
- Number of positive integers that are not the sum of 3 squares and a nonnegative (2n + 1)-st power.at n=5A322122
- a(n) is the number of vertices formed by n-secting the angles of a decagon.at n=29A335801
- a(n) is the number of partitions of n in which no part is divisible by 3 minus the number of basis partitions of n.at n=52A350636