1391
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1512
- Proper Divisor Sum (Aliquot Sum)
- 121
- 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
- 1272
- Möbius Function
- 1
- Radical
- 1391
- 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
- 114
- 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
- a(n) = Sum_{k = 1..n} floor(2^k / k).at n=12A000801
- Absolute value of Glaisher's beta'(2n+1).at n=37A002291
- Molien series for 6-dimensional complex reflection group 4.U_4 (3) of order 2^9 .3^7 .5.7.at n=32A008581
- Molien series for Weyl group E_8.at n=49A008582
- a(n) is the concatenation of n and 7n.at n=12A009441
- Partial sums of A003136.at n=33A014146
- Numbers k such that the k-th Euclid number A006862(k) = 1 + (Product of first k primes) is prime.at n=14A014545
- Expansion of 1/(1-x^6-x^7-x^8-x^9-x^10-x^11-x^12-x^13-x^14-x^15).at n=39A017855
- Number of elements in the set {(x,y): 1 <= x,y <= n, gcd(x,y)=1}.at n=46A018805
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite NON = Nonasil-[ 4158 ] [Si88O176].4R starting with a T4 atom.at n=10A019212
- Place where n-th 1 occurs in A023127.at n=33A022789
- a(n) = position of n^3 + 9 in A003072.at n=22A024971
- a(n) = (d(n)-r(n))/2, where d = A026054 and r is the periodic sequence with fundamental period (1,0,0,0).at n=20A026055
- a(n) = floor( e * 2^n ).at n=9A027437
- Number of subgroups of index n of fundamental group of the non-orientable cycle bundle over the Klein bottle.at n=43A027844
- Numbers with exactly five distinct base-6 digits.at n=1A031983
- Coordination sequence T1 for Zeolite Code CFI.at n=25A033599
- Decimal part of a(n)^(1/2) starts with n so that a(n)<a(n+1).at n=29A034067
- Number of not-necessarily-symmetric n X 2 crossword puzzle grids.at n=7A034182
- Multiplicity of highest weight (or singular) vectors associated with character chi_65 of Monster module.at n=33A034453