5225
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 7440
- Proper Divisor Sum (Aliquot Sum)
- 2215
- 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
- 3600
- Möbius Function
- 0
- Radical
- 1045
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- 85
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- Number of centered hydrocarbons with n atoms.at n=16A000022
- Number of partitions of floor(5n/2) into n nonnegative integers each no more than 5.at n=29A001975
- Discriminants of totally real quartic fields (see comments).at n=18A002769
- Number of walks on cubic lattice.at n=24A005570
- a(n) = (n^3 + 2*n)/3.at n=25A006527
- Expansion of Jacobi theta constant (theta_2/2)^20.at n=4A014806
- a(n) = n*(29*n - 1)/2.at n=19A022286
- Discriminants of totally real quartic fields.at n=21A023680
- a(n) = (1/4 + 1/6 + ... + 1/c(n))*LCM{4, 6, ..., c(n)}, where c(n) = n-th composite number.at n=8A025545
- Numbers k such that 51*2^k+1 is prime.at n=29A032375
- Numbers k such that 81*2^k+1 is prime.at n=45A032390
- Numbers that are palindromic and divisible by 5.at n=15A043040
- Numbers whose base-4 representation contains exactly four 1's and two 2's.at n=27A045107
- Duplicate of A043040.at n=14A045640
- Palindromes with exactly 4 prime factors (counted with multiplicity).at n=30A046330
- Number of nonnegative integer 2 X 2 matrices with sum of elements equal to n, under row and column permutations.at n=48A053307
- a(n) = (2*n+1)*(4*n^2+4*n+3)/3.at n=12A057813
- a(n) = a(n-1) + a(n - 1 minus the number of terms of a(k) == n (mod 3) so far).at n=32A060730
- a(n) = n^2 + (n^2 with digits reversed).at n=32A061226
- Numbers k such that k and its reversal are both multiples of 19.at n=17A062907