Properties of the Number 18145

Eighteen Thousand One Hundred Forty-Five

Basics

Value: 18144 → 18145 → 18146

Parity: odd

Prime: No

Previous Prime: 18143

Next Prime: 18149

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 × 19 × 191

Divisors: 1, 5, 19, 95, 191, 955, 3629, 18145

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011011100001

Octal: 43341

Duodecimal: A601

Hexadecimal: 46e1

Square: 329241025

Square Root: 134.70337783441067

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

Doubly triangular numbers: a(n) = n*(n+1)*(n²+n+2)/8. A2817

a(n) = p*(p-1)/2 for p = prime(n). A8837

Primitive numbers in A229307. A229311

Numbers k such that 3^k - 26 is prime. A219045

Primitive numbers in A229306. A229310

Number of non-equivalent ways to choose two points in an equilateral triangle grid of side n. A227327

Triangular numbers with property that digits alternate in parity. A68882

a(n) = (3·2^n-1-1)*(3·2ⁿ-1). A169720

a(n) = 5·n*(5·n + 1)/2. A144312

a(n) = 14·n² + 1. A158482