Properties of the Number 19801

Nineteen Thousand Eight Hundred One

Basics

Value: 19800 → 19801 → 19802

Parity: odd

Prime: Yes

Previous Prime: 19793

Next Prime: 19813

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 19801

Divisors: 1, 19801

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110101011001

Octal: 46531

Duodecimal: B561

Hexadecimal: 4d59

Square: 392079601

Square Root: 140.71602609511115

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

Primes whose base-3 representation also is the base-2 representation of a prime. A235265

Primes of the form j² + (j+1)². A27862

Primes that are palindromic in base 2 (but written here in base 10). A16041

Primitive part of Fibonacci(n). A61446

Difference between the arithmetic mean of the neighbors of the terms and the term itself follows the pattern 0,1,2,3,4,5,... A86514

Prime hypotenuses of Pythagorean triangles with a prime leg. A67756

Balanced primes of order four. A82079

Centered 20-gonal (or icosagonal) numbers. A69133

Smallest primitive prime factor of Fibonacci number F(n), or 1 if F(n) has no primitive prime factor. A1578

Primes of form n² + 10000. A256838