4531
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4752
- Proper Divisor Sum (Aliquot Sum)
- 221
- 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
- 4312
- Möbius Function
- 1
- Radical
- 4531
- 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
- 64
- 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
- Critical connected topologies with n points.at n=8A003097
- Coordination sequence T1 for Zeolite Code BIK.at n=40A008047
- Numbers k such that the continued fraction for sqrt(k) has period 58.at n=20A020397
- n written in fractional base 7/4.at n=43A024641
- Coordination sequence T4 for Zeolite Code ITE.at n=46A027372
- Numbers k such that 221*2^k+1 is prime.at n=25A032487
- Number of partitions of n into parts not of the form 23k, 23k+4 or 23k-4. Also number of partitions with at most 3 parts of size 1 and differences between parts at distance 10 are greater than 1.at n=31A035992
- Becomes prime after n iterations of f(x) = phi(x)+1 (least inverse of A039651).at n=11A039652
- Coordination sequence T3 for Zeolite Code MTF.at n=40A057306
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 53 ).at n=39A063326
- Numbers k such that A048138(k) is a prime and sets a new record for such primes.at n=23A064440
- Arithmetic means of rows of A083173.at n=44A083176
- Sum of first n 5-almost primes.at n=22A086047
- Numbers n such that n, n+2, n+4, n+6 are semiprimes.at n=42A092126
- Numbers k such that (k!/k#) * 2^k + 1 is prime, where n# = primorial numbers (A034386).at n=19A108894
- Number of base 17 n-digit numbers with adjacent digits differing by three or less.at n=4A126485
- Weak Goodstein sequence starting at 11.at n=23A137411
- Continued fraction for 6th Du Bois Reymond constant.at n=1A138731
- Second term of continued fraction for 2n-th Du Bois Reymond constant.at n=2A138733
- a(n) = Frobenius number for 4 successive primes = F[p(n), p(n+1), p(n+2), p(n+3)].at n=38A138990