3751
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 4256
- Proper Divisor Sum (Aliquot Sum)
- 505
- 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
- 3300
- Möbius Function
- 0
- Radical
- 341
- 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
- 61
- 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
- 10-gonal (or decagonal) numbers: a(n) = n*(4*n-3).at n=31A001107
- Squares written in base 8.at n=44A002441
- Numbers k such that 2*3^k - 1 is prime.at n=20A003307
- Pseudoprimes to base 3.at n=16A005935
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly three 1's.at n=42A013650
- Positive integers n such that 2^n == 2^11 (mod n).at n=50A015935
- Pseudoprimes to base 9.at n=34A020138
- Pseudoprimes to base 27.at n=31A020155
- Pseudoprimes to base 40.at n=19A020168
- Pseudoprimes to base 94.at n=35A020222
- Strong pseudoprimes to base 9.at n=10A020235
- Strong pseudoprimes to base 81.at n=14A020307
- a(n) = floor(C(4n,2n)/C(4n,n)).at n=16A024501
- a(n) = least m such that if r and s in {1/2, 1/4, 1/6, ..., 1/2n} satisfy r < s, then r < k/m < (k+2)/m < s for some integer k.at n=26A024842
- a(n) = Sum_{k=0..n} (k+1) * A026637(n,k).at n=9A026970
- Odd 10-gonal (or decagonal) numbers.at n=15A028993
- Sums of distinct powers of 5.at n=49A033042
- Trimorphic numbers: n^3 ends with n. Also m-morphic numbers for all m > 5 such that m-1 is not divisible by 10 and m == 3 (mod 4).at n=27A033819
- Sums of 3 distinct powers of 5.at n=16A038475
- Number of sublattices of index n in generic 5-dimensional lattice.at n=5A038992