1529
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1680
- 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
- 1380
- Möbius Function
- 1
- Radical
- 1529
- 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
- 60
- 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 10 positive 6th powers.at n=22A003366
- Number of Van Lier sequences of length n.at n=5A005272
- Odd numbers not of form p + 2^k (de Polignac numbers).at n=27A006285
- Somos-4 sequence: a(0)=a(1)=a(2)=a(3)=1; for n >= 4, a(n) = (a(n-1) * a(n-3) + a(n-2)^2) / a(n-4).at n=10A006720
- Elliptic divisibility sequence associated with elliptic curve "37a1": y^2 + y = x^3 - x and multiples of the point (0,0).at n=17A006769
- Coordination sequence T1 for Zeolite Code AET.at n=27A008007
- Coordination sequence T2 for Zeolite Code FER.at n=24A008107
- Coordination sequence T1 for Zeolite Code LTN.at n=27A008140
- Coordination sequence T1 for Zeolite Code MON.at n=24A008181
- Coordination sequence T2 for Zeolite Code -PAR.at n=28A009856
- sec(tan(tanh(x)))=1+1/2!*x^2+5/4!*x^4+13/6!*x^6+41/8!*x^8...at n=5A012172
- Partial sums of A001935; at one time this was conjectured to agree with A007478.at n=24A014605
- a(n) = 11*a(n-1) + 9*a(n-2).at n=4A015603
- Numbers k such that phi(k) | sigma_11(k).at n=50A015769
- Six iterations of Reverse and Add are needed to reach a palindrome.at n=26A015984
- Numbers k such that the continued fraction for sqrt(k) has period 28.at n=22A020367
- Fibonacci sequence beginning 1, 10.at n=12A022100
- Numbers k such that Fibonacci(k) == 89 (mod k).at n=24A023182
- a(n) = floor( (2nd elementary symmetric function of S(n))/(first elementary symmetric function of S(n)) ), where S(n) = {first n+1 positive integers congruent to 1 mod 3}.at n=44A024219
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (1, p(1), p(2), ...), t = (composite numbers).at n=16A024480