3651
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4872
- Proper Divisor Sum (Aliquot Sum)
- 1221
- 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
- 2432
- Möbius Function
- 1
- Radical
- 3651
- 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
- 43
- 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
- 3rd power of rooted tree enumerator; number of linear forests of 3 rooted trees.at n=8A000242
- Coefficients of a Bessel function (reciprocal of J_0(z)); also pairs of permutations with rise/rise forbidden.at n=5A000275
- Coordination sequence T4 for Zeolite Code MEI.at n=44A008149
- Coordination sequence T5 for Zeolite Code MTW.at n=40A008200
- Molien series for 6-dimensional complex reflection group 4.U_4 (3) of order 2^9 .3^7 .5.7.at n=41A008581
- [ (4th elementary symmetric function of P(n))/(2nd elementary symmetric function of P(n)) ], where P(n) = {first n+3 primes}.at n=10A024456
- a(n) = least m such that if r and s in {1/1, 1/4, 1/7, ..., 1/(3n-2)} satisfy r < s, then r < k/m < (k+1)/m < s for some integer k.at n=27A024836
- a(n) = position of n^3 + 9 in A003072.at n=31A024971
- T(n, 2*n-4), T given by A027960.at n=15A027966
- 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 59.at n=17A031557
- Numbers whose base-5 representation contains exactly two 0's and three 1's.at n=40A045168
- Discriminants of imaginary quadratic fields with class number 18 (negated).at n=26A046015
- McKay-Thompson series of class 41A for Monster.at n=40A058670
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 76 ).at n=35A063349
- Number of partitions of n into Lucas parts (A000032).at n=45A067593
- Interprimes which are of the form s*prime, s=3.at n=45A075278
- Expansion of (1-x)^(-1)/(1-x+2*x^2-2*x^3).at n=28A077874
- Expansion of exp(2x)+exp(x)BesselI_0(2x).at n=9A081669
- Numbers n such that n and n+1 both are members of A074997; i.e., on the one hand n-1 and n+1 have the same prime signature, on the other hand n and n+2 have the same prime signature.at n=25A086540
- Decimal positions where Pi, E and Phi are the same.at n=42A090230