16513
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 19266
- Proper Divisor Sum (Aliquot Sum)
- 2753
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 14112
- Möbius Function
- 0
- Radical
- 2359
- Omega Function (Ω)
- 3
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 97
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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(n) = 1^n + 2^n + 4^n.at n=7A001576
- Numbers that are the sum of 3 positive 7th powers.at n=11A003370
- Divisors of 2^21 - 1.at n=8A003530
- Divisors of 2^42 - 1.at n=34A003547
- Numbers that are the sum of at most 3 positive 7th powers.at n=24A004865
- Numbers that are the sum of at most 4 positive 7th powers.at n=40A004866
- Hyperperfect numbers: k = m*(sigma(k) - k - 1) + 1 for some m > 1.at n=10A007592
- a(n) = sigma_7(n), the sum of the 7th powers of the divisors of n.at n=3A013955
- Numbers k that divide 8^k - 1.at n=8A014949
- Numerator of sum of -7th powers of divisors of n.at n=3A017677
- 6-hyperperfect numbers: n = 6*(sigma(n) - n - 1) + 1.at n=1A028499
- Hyperperfect numbers: x such that x = 1 + k*(sigma(x)-x-1) for some k > 0.at n=14A034897
- Bessel function Y_0(n) is a monotonically decreasing positive sequence.at n=31A046961
- Number of primitive subsequences of {1, 2, ..., n}.at n=21A051026
- Numbers k such that k | 4^k + 2^k + 1.at n=6A057845
- Numbers k > 1 such that, in base 8, k and k^2 contain the same digits in the same proportion.at n=14A061662
- Numbers of the form (2^(m*r)-1)/(2^r-1) for positive integers m, r.at n=39A064896
- Numbers n such that sum of squares of even digits of n equals sum of squares of odd digits of n.at n=27A076164
- a(n) = 16*n^2 + 4*n + 1.at n=32A082041
- Array read by downwards antidiagonals: sigma_k(n) for n >= 1, k >= 0.at n=62A109974