1145
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1380
- Proper Divisor Sum (Aliquot Sum)
- 235
- 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
- 912
- Möbius Function
- 1
- Radical
- 1145
- 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
- 150
- 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
- Primes multiplied by 5.at n=49A001750
- a(n+1) = (n^2 - 1)*a(n) + n + 1.at n=4A006041
- Number of factorization patterns of polynomials of degree n over F_3.at n=14A006168
- Coordination sequence T1 for Zeolite Code BPH.at n=26A008055
- Coordination sequence T1 for Zeolite Code VFI.at n=26A008245
- If a, b in sequence, so is ab+7.at n=15A009312
- Coordination sequence T1 for Zeolite Code -PAR.at n=24A009855
- Numbers k such that the continued fraction for sqrt(k) has period 5.at n=33A010337
- sec(sin(sin(x)))=1+1/2!*x^2-3/4!*x^4-27/6!*x^6+1145/8!*x^8...at n=4A012012
- Number of partitions of n into distinct parts, none being 2.at n=45A015744
- Positive integers n such that 2^n == 2^5 (mod n).at n=40A015925
- Inverse Euler transform of A000931.at n=37A018243
- a(n) = n*(23*n - 1)/2.at n=10A022280
- Numbers k such that Fibonacci(k) == 5 (mod k).at n=39A023176
- Convolution of natural numbers with Beatty sequence for tau^2 A001950.at n=12A023542
- Hypotenuses of more than one primitive Pythagorean triangle.at n=40A024409
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (Lucas numbers), t = (odd natural numbers).at n=12A024473
- Every suffix prime and no 0 digits in base 8 (written in base 8).at n=45A024783
- Index of 9^n within the sequence of the numbers of the form 9^i*10^j.at n=48A025739
- a(n) = (d(n)-r(n))/2, where d = A026063 and r is the periodic sequence with fundamental period (1,1,0,1).at n=14A026064