2771
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2952
- Proper Divisor Sum (Aliquot Sum)
- 181
- 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
- 2592
- Möbius Function
- 1
- Radical
- 2771
- 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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 66
- 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
- Construct a triangle as in A036262. Sequence is one less than the position of the first number larger than 2 in the n-th row (n-th difference).at n=38A000232
- Coordination sequence T2 for Zeolite Code -WEN.at n=38A009863
- Number of partitions of n into 5 unordered relatively prime parts.at n=46A023025
- Number of distinct prime signatures of the positive integers up to 2^n.at n=36A025488
- 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 51.at n=20A031549
- Numerators of partial sums of Bernoulli numbers B_{2n} = A000367/A002445.at n=5A035078
- Position of first term > 2 in n-th row of Gilbreath array shown in A036262.at n=40A036277
- Coordination sequence T5 for Zeolite Code STT.at n=35A038415
- Denominators of continued fraction convergents to sqrt(935).at n=9A042809
- Numbers whose base-14 representation has exactly 4 runs.at n=12A043665
- Numbers n such that string 1,8 occurs in the base 9 representation of n but not of n-1.at n=38A044268
- Numbers n such that string 7,1 occurs in the base 10 representation of n but not of n-1.at n=30A044403
- Numbers k such that string 1,8 occurs in the base 9 representation of k but not of k+1.at n=38A044649
- Numbers n such that string 7,1 occurs in the base 9 representation of n but not of n+1.at n=37A044696
- Numbers n such that string 7,1 occurs in the base 10 representation of n but not of n+1.at n=30A044784
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 18.at n=31A051983
- Numbers k such that the base-3 expansions of 2^k and 2^(k+1) have the same number of 1's and the same number of digits.at n=37A056735
- Sum of first n semiprimes.at n=42A062198
- Semiprimes p1*p2 such that p2 mod p1 = 10, with p2 > p1.at n=16A064908
- Numbers k such that phi(k) is the reversal of sigma(k).at n=2A069225