Properties of the Number 18181

Eighteen Thousand One Hundred Eighty-One

Basics

Value: 18180 → 18181 → 18182

Parity: odd

Prime: Yes

Previous Prime: 18169

Next Prime: 18191

Digit Sum: 19

Digital Root: 1

Palindrome: Yes

Factorization: 18181

Divisors: 1, 18181

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011100000101

Octal: 43405

Duodecimal: A631

Hexadecimal: 4705

Square: 330548761

Square Root: 134.8369385591352

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

Palindromic primes: prime numbers whose decimal expansion is a palindrome. A2385

Undulating primes (digits alternate). A32758

Undulating palindromic primes: numbers that are prime, palindromic in base 10, and the digits alternate: ababab... with a ≠ b. A59758

Euler transform of A027656(n-1). A35528

Primes having only {0, 1, 8} as digits. A61247

Strobogrammatic primes. A7597

Primes that contain digits 1 and 8 only. A20456

Numbers with mirror symmetry about middle. A6072

Class 6+ primes. A81634

Smallest palindromic prime containing exactly n 1's. A83972