16118
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
- 24180
- Proper Divisor Sum (Aliquot Sum)
- 8062
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8058
- Möbius Function
- 1
- Radical
- 16118
- 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
- 53
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers k such that 27*2^k-1 is prime.at n=33A050539
- a(1) = 6, a(n) = smallest number of the form k*a(n-1) +1 with the same prime signature p*q (6 = 2*3), where p and q are primes.at n=8A085066
- a(1) = 6, a(n) = smallest number of the form k*a(n-1) + 1 with the same number of divisors, i.e., 4.at n=8A085067
- Constant term of the reduction of n-th polynomial at A157751 by x^2->x+2.at n=9A192338
- Numbers k such that sigma(k - 2) = sigma(k + 2).at n=21A223091
- Number of partitions of n such that 2*(number of distinct parts) = number of parts.at n=50A239959
- Partial sums of A253088.at n=29A255048
- Record numbers of unordered triples {a, b, c} of distinct positive integers from 1 to n such that a*b = c*n.at n=48A292430
- Number of unlabeled clutters (connected antichains) spanning up to n vertices without singleton edges.at n=6A304981
- Numbers k such that k and k+4 are consecutive cubefree numbers.at n=7A349235