Properties of the Number 13181

Thirteen Thousand One Hundred Eighty-One

Basics

Value: 13180 → 13181 → 13182

Parity: odd

Prime: No

Previous Prime: 13177

Next Prime: 13183

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 7 ² × 269

Divisors: 1, 7, 49, 269, 1883, 13181

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11001101111101

Octal: 31575

Duodecimal: 7765

Hexadecimal: 337d

Square: 173738761

Square Root: 114.80853626799707

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

Number of odd terms in fⁿ, where f = x⁴*y⁴ + x⁴*y³ + x³*y⁴ + x⁴*y² + x²*y⁴ + x⁴*y + x³*y² + x²*y³ + x·y⁴ + x⁴ + x²*y² + y⁴ + x³ + x²*y + x·y² + y³ + x² + y² + x + y + 1. A246034

Strings of 5 digits from 1...9, such that no formula using the single digits in the given order exists that evaluates to 0. A288355

Consider the family of multigraphs enriched by the species of partitions. Sequence gives the triangle read by rows giving coefficients of polynomials arising from enumeration of those multigraphs on n arcs of 7 different colors. A98362

The number of vertices formed on a triangle with leg lengths equal to the Pythagorean triples by the straight line segments mutually connecting all vertices and all points that divide the sides into unit length parts. A333136

Numbers m such that σ(m+1)+σ(m-1) = 5*φ(m). A67242

Partial sum of irregular primes A000928. A132360

a(n) = 338·n - 1. A157999

a(n) = 78·n² - 1. A158771

Numbers k such that φ(k) divides (σ(k+1) + σ(k-1)). A67244

Numbers k such that k and k² use only the digits 1, 3, 6, 7 and 8. A137038