2225
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 2790
- Proper Divisor Sum (Aliquot Sum)
- 565
- 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
- 1760
- Möbius Function
- 0
- Radical
- 445
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 138
- 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
- Coefficient of q^(2n-1) in the series expansion of Ramanujan's mock theta function f(q).at n=33A000199
- Numbers that are the sum of 2 squares in exactly 3 ways.at n=20A000443
- Number of partitions of at most n into at most 5 parts.at n=24A002622
- Discriminants of totally real quartic fields (see comments).at n=5A002769
- Indices of primes where largest gap occurs.at n=12A005669
- Coordination sequence T7 for Zeolite Code MFI.at n=30A008170
- Coordination sequence T1 for Zeolite Code MON.at n=29A008181
- Coordination sequence T1 for Zeolite Code MTT.at n=29A008189
- Coordination sequence T5 for Zeolite Code MTT.at n=29A008193
- Crystal ball sequence for planar net 3.6.3.6.at n=31A008580
- Coordination sequence T1 for Zeolite Code VET.at n=29A009902
- Triangle read by rows, the inverse Bell transform of n!*binomial(5,n) (without column 0).at n=18A013988
- Number of ordered quadruples of integers from [ 1,n ] with no common factors between pairs.at n=25A015636
- Powers of cube root of 18 rounded down.at n=8A018027
- Powers of cube root of 18 rounded to nearest integer.at n=8A018028
- Fibonacci sequence beginning 0, 25.at n=11A022359
- Expansion of Product_{m>=1} 1/(1 + m*q^m).at n=22A022693
- a(n) = b(n) + d(n), where b(n) = (n-th Lucas number > 3) and d(n) = (n-th number that is 1 or 2 or is not a Fibonacci number).at n=13A023498
- Discriminants of totally real quartic fields.at n=6A023680
- a(n) = [ C(2n,n)/2^(n+3) ].at n=17A024506