7631
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
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8232
- Proper Divisor Sum (Aliquot Sum)
- 601
- 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
- 7032
- Möbius Function
- 1
- Radical
- 7631
- 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
- 176
- 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
- Numerators of continued fraction convergents to sqrt(823).at n=6A042588
- Numbers having four 5's in base 6.at n=11A043392
- Triangle read by rows, related to number of permutations of [n] with 0 successions and k rises.at n=25A046739
- Inverse Moebius transform of A001371 (starting at term 0).at n=18A054158
- Record entries in A065191.at n=42A065192
- Antidiagonal sums of square array A082011 divided by the number of the antidiagonal.at n=43A082015
- Numbers k such that the square of k contains sigma(k) as a substring, in base 10.at n=9A113654
- a(0) = 0, a(1) = 1; for n >= 2, a(n) = a(n-1) + a(n-2) - (n-1) if that number is positive and not already in the sequence, otherwise a(n) = a(n-1) + a(n-2) + (n-1).at n=21A117824
- Third extended Jacobsthal recurrence: a(n)=4a(n-1)-6(n-2)+4a(n-3)-a(n-4)+2a(n-5).at n=16A134987
- Sums of prime points found in four grids in each corner of a square.at n=39A161190
- Triangle read by rows: expansion of e.g.f. (1 - x)/(exp(t)*(1 - x*exp(t*(1 - x)))).at n=41A168423
- Number of disconnected 2-regular simple graphs on n vertices with girth at least 4.at n=57A185224
- Number of different ways to divide an n X 5 rectangle into subsquares, considering only the list of parts.at n=46A187753
- Number of n X 3 0..1 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.at n=10A223765
- Positions of peak values in A232221.at n=23A232359
- Semiprimes with digits in strictly decreasing order.at n=50A235108
- a(n) = 6*n^2 + 8*n + 1.at n=35A239325
- Number of length n permutations avoiding (123,{2},{}) and (123,{},{1}).at n=9A249562
- Record values in A085398.at n=17A250218
- Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock antidiagonal maximum minus diagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal minimum nondecreasing vertically.at n=18A253393