1156
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 9
- Divisor Sum
- 2149
- Proper Divisor Sum (Aliquot Sum)
- 993
- 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
- 544
- Möbius Function
- 0
- Radical
- 34
- Omega Function (Ω)
- 4
- 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
- yes
- 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
- 31
- 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
- yes
- Achilles Number
- no
- Perfect Power
- yes
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Appears in sequences
- n followed by n^2.at n=67A000463
- Perfect powers: m^k where m > 0 and k >= 2.at n=43A001597
- Prime numbers of measurement.at n=32A002049
- Squares and cubes.at n=41A002760
- Numbers that are the sum of 9 positive 5th powers.at n=44A003354
- Expansion of (1 + x - x^5) / (1 - x)^3.at n=43A004120
- a(n) = Sum_{k=0..n-1} Bell(k), where the Bell numbers Bell(k) are given in A000110.at n=8A005001
- Random walks.at n=3A005025
- Centered pentagonal numbers: (5n^2+5n+2)/2; crystal ball sequence for 3.3.3.4.4. planar net.at n=21A005891
- Octahedral numbers: a(n) = n*(2*n^2 + 1)/3.at n=12A005900
- Expansion of (1+x^2)/((1-x)^2*(1-x^2)^2).at n=22A005993
- a(n) = a(n-1) + a(n-3) + a(n-4), a(0) = a(1) = a(2) = 1, a(3) = 2.at n=16A006498
- Squared Fibonacci numbers: a(n) = F(n)^2 where F = A000045.at n=9A007598
- Prime(n)*...*prime(a(n)) is the least product of consecutive primes that is non-deficient.at n=23A007684
- Prime(n)*...*prime(a(n)) is the least product of consecutive primes which is abundant.at n=23A007707
- Erroneous version of A048798.at n=32A007914
- Product of divisors of n.at n=33A007955
- Coordination sequence T2 for Zeolite Code DOH.at n=21A008079
- Coordination sequence T2 for Zeolite Code MEP.at n=20A008158
- Coordination sequence T4 for Zeolite Code MTT.at n=21A008192