2631
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3512
- Proper Divisor Sum (Aliquot Sum)
- 881
- 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
- 1752
- Möbius Function
- 1
- Radical
- 2631
- 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
- 190
- 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
- Tetranacci numbers A073817 without the leading term 4.at n=11A001648
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite RTH = RUB-13 [B2Si30O64].2R starting with a T2 atom.at n=11A019227
- Numbers k such that Fibonacci(k) == -2 (mod k).at n=41A023163
- 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 34.at n=18A031532
- Concatenation of n and n + 5 or {n,n+5}.at n=25A032610
- a(n) = floor(10^5/n).at n=37A033427
- Multiplicity of highest weight (or singular) vectors associated with character chi_29 of Monster module.at n=34A034417
- Numbers for which the sum of reciprocals of digits is an integer.at n=44A034708
- Number of winning length n strings with a 3-symbol alphabet in "same game".at n=9A035617
- Number of partitions in parts not of the form 11k, 11k+1 or 11k-1. Also number of partitions with no part of size 1 and differences between parts at distance 4 are greater than 1.at n=37A035944
- Number of partitions of n into parts not of form 4k+2, 20k, 20k+9 or 20k-9. Also number of partitions in which no odd part is repeated, with at most 4 parts of size less than or equal to 2 and where differences between parts at distance 4 are greater than 1 when the smallest part is odd and greater than 2 when the smallest part is even.at n=38A036028
- Number of 3-component Carmichael numbers C = (6M + 1)(12M + 1)(18M + 1) < 10^n.at n=17A036060
- Coordination sequence T14 for Zeolite Code STT.at n=34A038430
- Numerators of continued fraction convergents to sqrt(767).at n=8A042478
- Numbers n such that string 0,7 occurs in the base 8 representation of n but not of n-1.at n=45A044194
- Numbers k such that the string 4,3 occurs in the base 9 representation of k but not of k-1.at n=36A044290
- Numbers n such that string 3,1 occurs in the base 10 representation of n but not of n-1.at n=29A044363
- Numbers n such that string 4,3 occurs in the base 9 representation of n but not of n+1.at n=36A044671
- Numbers n such that string 3,1 occurs in the base 10 representation of n but not of n+1.at n=29A044744
- Denominators of convergents to A058914.at n=17A048818