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Properties of the Number 13128

Thirteen Thousand One Hundred Twenty-Eight

Basics

Value: 13127 → 13128 → 13129

Parity: even

Prime: No

Previous Prime: 13127

Next Prime: 13147

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 3 × 3 × 547

Divisors: 1, 2, 3, 4, 6, 8, 12, 24, 547, 1094

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 11001101001000

Octal: 31510

Duodecimal: 7720

Hexadecimal: 3348

Square: 172344384

Square Root: 114.57748469922004

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Numbers n such that m + (sum of digits in base-3 representation of m) = n has exactly four solutions. A230856
Numbers that are the sum of 8 nonzero 8th powers. A3386
T(n,k)=Number of nXk 0..4 arrays with no element equal to the sum of elements to its left or the sum of the elements above it, modulo 5. A239194
T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 4, 5 or 8 king-move adjacent elements, with upper left element zero. A305452
a(n) = ∑k=0..floor(n/3) binomial(2·n-6·k,n-3·k). A360153
Place n points in general position on each side of an equilateral triangle, and join every pair of the 3·n+3 boundary points by a chord; sequence gives number of edges in the resulting planar graph. A367119
Birooted graphs: number of unlabeled graphs with n nodes rooted at 2 indistinguishable roots. A303829
Expansion of f(q)*f(q7)/(f(-q)*f(-q7)) in powers of q where f() is a Ramanujan θ function. A123862
T(n,k)=Equals one maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly one of their king-move neighbors in a random 0..2 nXk array. A220967
a(n) is the smallest number that is the sum of n positive 6th powers in two ways. A343079