11157
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
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 14880
- Proper Divisor Sum (Aliquot Sum)
- 3723
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7436
- Möbius Function
- 1
- Radical
- 11157
- 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
- 130
- 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
- Numbers k such that 10*3^k - 1 is prime.at n=40A005542
- Numbers k such that the continued fraction for sqrt(k) has period 84.at n=39A020423
- 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 70.at n=28A031568
- Lucky numbers with size of gaps equal to 20 (upper terms).at n=23A031903
- Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 24.at n=38A051965
- Consider all integer triples (i,j,k), j,k>0, with binomial(i+2,3)=binomial(j+2,3)+k^3, ordered by increasing i; sequence gives i values.at n=37A054221
- A054221 without cubes.at n=16A054224
- Record-setting differences between adjacent elements of the Mian-Chowla sequence variant A051788.at n=35A080223
- a(n)=a(n-1)+sum of digits(a(n-1))*sum of digits(a(n-2)).at n=41A108720
- Next term is the sum of previous term and the square of the sum of its decimal digits, with a(0) = 10.at n=37A112787
- Semiprimes for which both the sum and the product of the digits is also a semiprime.at n=29A118690
- Numbers k such that k!!-4 is prime.at n=21A123910
- Antidiagonal sums of A163280.at n=25A163983
- a(n) is the sum of the smallest parts of all partitions of n that do not contain 1 as a part.at n=37A182708
- Numbers that match polynomials over {0,1} that have a factor containing -3 as a coefficient; see Comments.at n=13A208182
- Number of partitions p of n such that 3*min(p) is a part of p.at n=36A238590
- Indices of squares of primes in A098550.at n=29A251240
- Numbers n such that n!!-8 is prime.at n=21A259359
- Numbers n such that 5^n-4^(n-1) is prime.at n=7A272296
- p-INVERT of the Fibonacci sequence (A000045), where p(S) = 1 - S^3.at n=12A292329