16181
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
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 17664
- Proper Divisor Sum (Aliquot Sum)
- 1483
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 14700
- Möbius Function
- 1
- Radical
- 16181
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 66
- 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
- A self-generating sequence: every positive integer occurs as a(i)-a(j) for a unique pair i,j.at n=23A001856
- Strong pseudoprimes to base 45.at n=7A020271
- Theorems from propositional calculus, translated into decimal digits.at n=23A101273
- G.f.: x*(1 - 2*x^2)/(1 - x - 3*x^2 - 3*x^3 - x^4).at n=12A114723
- Numbers n such that prime[(n + 1)^2] - prime[n^2] is a perfect cube.at n=2A145317
- a(n) = 1331*n - 1122.at n=12A157441
- Least happy number with next happy number of distance n.at n=35A193573
- Nonprime numbers with all divisors starting and ending with digit 1.at n=29A208261
- Records in A098550.at n=41A248647
- Least inverse of A073454: Smallest m such that m divided by the primes up to m have exactly n repeated residues.at n=20A274320
- Numbers n such that A277118(n) = 17.at n=8A277119
- a(n) is the largest integer that can be written with n digits in base 3/2.at n=20A304025
- 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=32A307858
- Number of different coefficient values in expansion of Product_{k=1..n} (1+x^(k^2)).at n=46A369786