2921
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3072
- Proper Divisor Sum (Aliquot Sum)
- 151
- 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
- 2772
- Möbius Function
- 1
- Radical
- 2921
- 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
- 79
- 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
- Numbers that are the sum of 9 positive 6th powers.at n=34A003365
- Related to self-avoiding walks on square lattice.at n=6A006815
- Number of strings on n symbols in Stockhausen problem.at n=4A008269
- Numbers k such that the continued fraction for sqrt(k) has period 50.at n=9A020389
- a(n) = n*(11*n+1)/2.at n=23A022269
- Conjectured number of irreducible multiple zeta values of depth 8 and weight 2n+22.at n=11A022496
- a(n) = greatest number in row n of A026098 that is not a positive power of 2.at n=50A026104
- Duplicate of A022269.at n=22A026817
- Coordination sequence T4 for Zeolite Code ITE.at n=37A027372
- Number of distinct products i*j*k with 1 <= i < j < k <= n.at n=36A027430
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 24 ones.at n=24A031792
- Decimal part of a(n)^(1/n) starts with a 'nine digits' anagram.at n=29A035136
- Number of partitions of n with equal number of parts congruent to each of 0, 2 and 3 (mod 5).at n=45A035575
- Numbers k > 1 such that k mod ord2(k) is even, where ord2(k) is the order of 2 mod k.at n=0A036260
- a(n) = least number not of form [ (a^2/n) ] + [ (b^2)/n ].at n=19A036575
- Coordination sequence T3 for Zeolite Code SFF.at n=36A038433
- Numbers having three 5's in base 8.at n=16A043443
- Numbers k such that string 0,5 occurs in the base 9 representation of k but not of k-1.at n=38A044256
- Numbers n such that string 2,1 occurs in the base 10 representation of n but not of n-1.at n=32A044353
- Numbers n such that string 0,5 occurs in the base 9 representation of n but not of n+1.at n=38A044637