1149
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1536
- Proper Divisor Sum (Aliquot Sum)
- 387
- 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
- 764
- Möbius Function
- 1
- Radical
- 1149
- 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
- 44
- 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
- Coordination sequence T2 for Zeolite Code AHT.at n=23A009867
- Coordination sequence T3 for Zeolite Code DFO.at n=26A009877
- Initial pile sizes which guarantee a win for player 2 in a certain variant of Nim.at n=28A016741
- Convolution of A000201 and A014306.at n=40A023666
- Numbers with exactly 3 4's in base 5 expansion.at n=20A023740
- a(n) = least m such that if r and s in {1/2, 1/5, 1/8, ..., 1/(3n-1)} satisfy r < s, then r < k/m < (k+1)/m < s for some integer k.at n=15A024837
- a(n) = least m such that if r and s in {1/2, 1/4, 1/6, ..., 1/2n} satisfy r < s, then r < k/m < (k+2)/m < s for some integer k.at n=14A024842
- Expansion of x^2*(2 - x + x^2) / ((1 + x)*(1 - x)^4).at n=17A026035
- a(n) = (1/2)*(n-th largest even number in array T given by A027170).at n=38A027184
- a(n) = n^2 - 7.at n=31A028881
- Coefficients in 1/(1+P(x)), where P(x) is the generating function of the primes.at n=20A030018
- Numbers having period-2 4-digitized sequences.at n=24A031184
- 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 22.at n=14A031520
- Numbers k such that 261*2^k+1 is prime.at n=34A032507
- Coordination sequence T3 for Zeolite Code SBT.at n=27A033614
- Composite numbers whose prime factors contain no digits other than 3 and 8.at n=7A036317
- Digits are nonzero squares.at n=44A036435
- a(n) is the number of distinct possible values of d(k), the number of divisors of k, among numbers k whose binary order (A029837) does not exceed n.at n=48A036470
- Numbers whose base-8 and base-10 expansions have the same digit sum.at n=48A037335
- Numbers whose base-12 representation has the same nonzero number of 7's and 9's.at n=33A039550