5123
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
- 5280
- Proper Divisor Sum (Aliquot Sum)
- 157
- 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
- 4968
- Möbius Function
- 1
- Radical
- 5123
- 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
- 147
- 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 8 positive 10th powers.at n=5A004808
- Numbers that are the sum of at most 8 nonzero 10th powers.at n=38A004903
- Numbers that are the sum of at most 10 nonzero 10th powers.at n=48A004905
- Number of blobs with vertical symmetry.at n=7A007161
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite DFO = DAF-1 [Mg14Al52P66O264].7R.40 H2O starting with a T3 atom.at n=5A019005
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly nine 1's.at n=13A020445
- n written in fractional base 9/5.at n=39A024653
- Denominators of continued fraction convergents to sqrt(22).at n=9A041035
- Multiply by 5 and reverse.at n=17A045539
- Difference between partial sums of partition numbers (A026905) and partial sums of numbers of partitions into distinct parts (A026906).at n=22A056870
- Number of times n occurs in A000195.at n=8A064780
- Number of partitions of n such that the set of parts has an even number of elements.at n=33A092306
- Number of 5k+2 primes (A030432) in range [2^n,2^(n+1)].at n=17A095022
- a(n) = Sum_{k=0..2*n} (n - floor(k/2))^k.at n=6A099556
- Least positive integer that can be represented as sum of a semiprime and a square in exactly n ways.at n=40A101181
- Smallest semiprime equal to the sum of n distinct primes.at n=48A104646
- Where record values of A119999 occur.at n=26A120001
- Composite numbers k such that k+d+1 is prime for all divisors d of k greater than 1.at n=35A120776
- a(n) = 2*n^2 + 15*n.at n=47A139579
- Number of 1-sided triangular polyedges with n cells.at n=5A151539