16251
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 21672
- Proper Divisor Sum (Aliquot Sum)
- 5421
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10832
- Möbius Function
- 1
- Radical
- 16251
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 97
- 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
- Sums of 3 distinct powers of 5.at n=26A038475
- Maximal elements of pairs of "Super Unitary Amicable Numbers", sorted by their minimal elements.at n=36A045614
- Numbers n for which there are exactly six k such that n = k + reverse(k).at n=39A072430
- a(n) = Sum_{d divides n} d^(n/d + 1).at n=24A078308
- a(n) = n^3 + n^2 + 1.at n=25A098547
- Triangular matrix, read by rows, equal to the matrix logarithm of triangle A105623.at n=21A105629
- Column 0 of triangle A105629, which is the matrix logarithm of triangle A105623.at n=6A105630
- a(n) = 1 + n^4 + n^6.at n=4A123656
- a(n) = 625*n + 1.at n=25A158383
- a(n) = 26*n^2 + 1.at n=25A158549
- Semiprimes q such that q^2-4 and q^2+4 are also semiprimes.at n=14A173084
- Expansion of g.f. (1-2*x+51*x^2)/(1-x)^3.at n=26A257352
- a(n) = number of n-digit binary numbers in which the first k and last k digits have a Hamming distance of 1 or less, for all k from 1 to n.at n=46A288793
- Number of sets of exactly seven nonempty words with a total of n letters over n-ary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.at n=4A293969
- L.g.f.: log(Product_{k>=1} (1 + k*x^k)) = Sum_{n>=1} a(n)*x^n/n.at n=24A300786