Properties of the Number 19681

Nineteen Thousand Six Hundred Eighty-One

Basics

Value: 19680 → 19681 → 19682

Parity: odd

Prime: Yes

Previous Prime: 19661

Next Prime: 19687

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 19681

Divisors: 1, 19681

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110011100001

Octal: 46341

Duodecimal: B481

Hexadecimal: 4ce1

Square: 387341761

Square Root: 140.28898745090436

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

a(n) = 3ⁿ - 2. A58481

Centered 24-gonal numbers. A69190

Primes of the form n² + 81. A256775

Primes of the form 3^k - 2. A14232

Least prime in A031924 (lesser of 6-twins) such that the distance to the next 6-twin is 2·n. A52352

Prime numbers of the form 3^k +- 2 for k >= 1. A144231

Expansion of ∏_k>=1 1/(1 - x^2·k+1)^k. A263150

Primes p such that A001175(p) = (p-1)/8. A308793

Largest prime < n³. A77037

Numbers n such that the decimal number concat(9,n) is a square. A273364