Properties of the Number 19841

Nineteen Thousand Eight Hundred Forty-One

Basics

Value: 19840 → 19841 → 19842

Parity: odd

Prime: Yes

Previous Prime: 19819

Next Prime: 19843

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 19841

Divisors: 1, 19841

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110110000001

Octal: 46601

Duodecimal: B595

Hexadecimal: 4d81

Square: 393665281

Square Root: 140.85808461000738

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 p for which the period of 1/p is a power of 2. A72982

Centered 40-gonal numbers. A195317

Smallest prime factor of 10ⁿ + 1. A38371

Primes of the form 128·k + 1. A208177

Irregular triangle read by rows: row n lists the distinct prime factors of the generalized Fermat number F_n(10) = 10^2ⁿ + 1. A391444

Where the prime race among 11k+1, ..., 11k+10 changes leader. A297410

Primes that become squares when prefixed with a 5. A167738

Numbers n such that the decimal number concat(5,n) is a square. A273360

Primes of the form (4·n²-8·n-9)/3. A154616

Smallest prime factor of 10^2ⁿ + 1. A185121