1233
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
- 6
- Divisor Sum
- 1794
- Proper Divisor Sum (Aliquot Sum)
- 561
- 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
- 816
- Möbius Function
- 0
- Radical
- 411
- Omega Function (Ω)
- 3
- 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
- 132
- 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
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers that are not the sum of 4 tetrahedral numbers.at n=51A000797
- Number of degree-n permutations of order dividing 3.at n=8A001470
- Primes written in base 5.at n=43A004679
- Maxima of the rows of the triangle A259095.at n=30A005577
- Pseudoprimes to base 10.at n=11A005939
- Parenthesized one way gives the powers of 2: (1), (2), (1+3), ..., another way the powers of 3: (1), (2+1), (3+6), ....at n=17A006895
- Coordination sequence T1 for Zeolite Code AWW.at n=25A008045
- Coordination sequence T1 for Zeolite Code BRE.at n=23A008058
- Coordination sequence T4 for Zeolite Code TON.at n=22A008244
- Table T(n,k) giving number of permutations of [1..n] with order dividing k, read by antidiagonals.at n=47A008307
- Molien series for 6-dimensional complex reflection group 4.U_4 (3) of order 2^9 .3^7 .5.7.at n=31A008581
- Expansion of e.g.f. tanh(x)*exp(tanh(x)).at n=7A009831
- Coordination sequence for FeS2-Pyrite, S position.at n=17A009956
- Positive integers n such that 2^n (mod n) == 2^9 (mod n).at n=57A015931
- Expansion of 1/(1-x^5-x^6-x^7-x^8-x^9-x^10).at n=36A017841
- Pseudoprimes to base 37.at n=27A020165
- Pseudoprimes to base 100.at n=15A020228
- Numbers k such that the continued fraction for sqrt(k) has period 24.at n=14A020363
- Fibonacci sequence beginning 3, 12.at n=11A022380
- a(n) = a(n-1) + c(n-1) for n >= 2, a( ) increasing, given a(1)=3, where c( ) is complement of a( ).at n=44A022935