1137
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1520
- Proper Divisor Sum (Aliquot Sum)
- 383
- 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
- 756
- Möbius Function
- 1
- Radical
- 1137
- 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
- 18
- 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
- Expansion of 1/((1-x)^2*(1-x^2)*(1-x^3)).at n=31A000601
- Numbers which are the sum of 3 nonzero 4th powers.at n=29A003337
- Numbers k such that k, k+1 and k+2 have the same number of divisors.at n=22A005238
- a(n) = solution to the postage stamp problem with n denominations and 7 stamps.at n=6A005342
- Expansion of cosh(tan(x).exp(x)).at n=6A009162
- Coordination sequence T1 for Zeolite Code RTE.at n=23A009890
- Expansion of 1/(1-x^2-x^3-x^4-x^5).at n=19A013982
- Numbers k such that the continued fraction for sqrt(k) has period 26.at n=19A020365
- a(n) = n^2 - phi(n)*tau(n)^2.at n=38A022157
- Number of partitions of n into 7 unordered relatively prime parts.at n=27A023027
- Index of 10^n within the sequence of the numbers of the form 5^i*10^j.at n=39A025743
- a(n) = (d(n)-r(n))/5, where d = A026043 and r is the periodic sequence with fundamental period (0,2,3,0,0).at n=22A026045
- a(n) = sum of the numbers between the two n's in A026366.at n=17A026369
- T(2n,n-3), T given by A026780.at n=3A026893
- Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 7 (most significant digit on right).at n=8A029500
- Odd n such that in n^2 the parity of digits alternates.at n=41A030155
- Numbers having period-2 4-digitized sequences.at n=23A031184
- 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=13A031520
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 12 ones.at n=36A031780
- Numbers k such that 255*2^k+1 is prime.at n=21A032504