3187
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 3188
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 3186
- Möbius Function
- -1
- Radical
- 3187
- Omega Function (Ω)
- 1
- 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
- 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
- 123
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 451
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Coordination sequence T2 for Zeolite Code AET.at n=39A008008
- Coordination sequence T10 for Zeolite Code EUO.at n=35A008096
- Coordination sequence T1 for Zeolite Code MFI.at n=36A008161
- Numbers k such that the continued fraction for sqrt(k) has period 58.at n=11A020397
- Primes that remain prime through 2 iterations of the function f(x) = 2x + 5.at n=42A023243
- Primes that remain prime through 2 iterations of function f(x) = 5x + 2.at n=37A023252
- Numbers that are the sum of 4 positive cubes in exactly 3 ways.at n=23A025405
- Numbers that are the sum of 4 positive cubes in 3 or more ways.at n=25A025407
- Numbers k such that k divides the (left) concatenation of all numbers <= k written in base 5 (most significant digit on right and removing all least significant zeros before concatenation).at n=5A029522
- Number of nonisomorphic idempotent groupoids with a nontrivial symmetry.at n=4A030249
- Numbers k such that binomial(2k,k) is not divisible by 3, 5 or 7.at n=7A030979
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 55.at n=15A031553
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 24 ones.at n=31A031792
- Lucky numbers with size of gaps equal to 12 (lower terms).at n=36A031894
- Primes of form x^2+51*y^2.at n=32A033233
- Coordination sequence T2 for Zeolite Code CFI.at n=37A033600
- Erroneous version of A323468.at n=8A035030
- Triangle: T(n,k), k<=n: groupoids with a nontrivial symmetry with n elements and k idempotents.at n=14A038020
- Numbers whose base-7 representation contains exactly three 2's.at n=28A043403
- Numbers n such that string 8,7 occurs in the base 10 representation of n but not of n-1.at n=34A044419