16
domain: N
Properties
Digital Properties
- Digit Count
- 2
- Digit Sum
- 7
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 5
- Divisor Sum
- 31
- Proper Divisor Sum (Aliquot Sum)
- 15
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8
- Möbius Function
- 0
- Radical
- 2
- Omega Function (Ω)
- 4
- 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
- yes
- 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
- 4
- Smith Number
- no
Classification
- Natural
- yes
- Even
- yes
- Odd
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- yes
- Achilles Number
- no
- Perfect Power
- yes
- Smooth Number
- yes
- Carmichael Number
- no
Names
- German
- sechzehn· ordinal: sechzehnte
- English
- sixteen· ordinal: sixteenth
- Spanish
- dieciséis· ordinal: decimosexto
- French
- seize· ordinal: seizième
- Italian
- sedici· ordinal: 16º
- Latin
- sedecim· ordinal: 16.
- Portuguese
- dezesseis· ordinal: 16º
Appears in sequences
- Integer part of square root of n-th prime.at n=54A000006
- Integer part of square root of n-th prime.at n=55A000006
- Integer part of square root of n-th prime.at n=56A000006
- Integer part of square root of n-th prime.at n=57A000006
- Integer part of square root of n-th prime.at n=58A000006
- Integer part of square root of n-th prime.at n=59A000006
- Integer part of square root of n-th prime.at n=60A000006
- Number of ways of making change for n cents using coins of 1, 2, 5, 10 cents.at n=13A000008
- Euler totient function phi(n): count numbers <= n and prime to n.at n=16A000010
- Euler totient function phi(n): count numbers <= n and prime to n.at n=31A000010
- Euler totient function phi(n): count numbers <= n and prime to n.at n=33A000010
- Euler totient function phi(n): count numbers <= n and prime to n.at n=39A000010
- Euler totient function phi(n): count numbers <= n and prime to n.at n=47A000010
- Euler totient function phi(n): count numbers <= n and prime to n.at n=59A000010
- Smallest prime power >= n.at n=13A000015
- Smallest prime power >= n.at n=14A000015
- Smallest prime power >= n.at n=15A000015
- a(n) is the number of distinct (infinite) output sequences from binary n-stage shift register which feeds back the complement of the last stage.at n=8A000016
- Erroneous version of A032522.at n=8A000017
- Number of primitive permutation groups of degree n.at n=72A000019