1125
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 9
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 2028
- Proper Divisor Sum (Aliquot Sum)
- 903
- 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
- 600
- Möbius Function
- 0
- Radical
- 15
- Omega Function (Ω)
- 5
- 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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 44
- 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
- yes
- Perfect Power
- no
- Smooth Number
- yes
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of partitions of at most n into at most 5 parts.at n=20A002622
- Discriminants of totally real quartic fields (see comments).at n=1A002769
- Numbers that are the sum of 2 positive cubes.at n=47A003325
- Numbers that are the sum of 9 positive 5th powers.at n=42A003354
- Numbers of the form 3^i*5^j with i, j >= 0.at n=19A003593
- P-positions in Epstein's Put or Take a Square game.at n=32A005240
- Smallest label f(T) given to a rooted tree T with n nodes in Matula-Goebel labeling.at n=13A005517
- Number of n-node animals on f.c.c. lattice.at n=5A007198
- Number of elements (a b, c d) in GL(2,Z) with |det| = 1, trace <= n and 0 <= a <= {b, c} <= d.at n=50A007295
- 11-gonal (or hendecagonal) pyramidal numbers: a(n) = n*(n+1)*(3*n-2)/2.at n=9A007586
- Coordination sequence T1 for Zeolite Code FAU.at n=28A008105
- Coordination sequence T1 for Zeolite Code GOO.at n=23A008111
- Multiples of 25.at n=45A008607
- Numbers n such that n^2 and n have same last 2 digits.at n=46A008852
- Coordination sequence T3 for Zeolite Code -WEN.at n=24A009864
- Numbers k such that k | 14^k + 1.at n=28A015965
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite HEU = Heulandite Ca4[Al8Si28O72].24H2O starting with a T4 atom.at n=10A019135
- a(n) = n^2*(n-1)^3/4.at n=6A019584
- Numbers k such that the continued fraction for sqrt(k) has period 28.at n=12A020367
- a(n) = n*(7*n - 1)/2.at n=18A022264