Properties of the Number 17921

Seventeen Thousand Nine Hundred Twenty-One

Basics

Value: 17920 → 17921 → 17922

Parity: odd

Prime: Yes

Previous Prime: 17911

Next Prime: 17923

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 17921

Divisors: 1, 17921

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011000000001

Octal: 43001

Duodecimal: A455

Hexadecimal: 4601

Square: 321162241

Square Root: 133.86933928274988

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 of the form 1024n + 513. A105132

Primes of form n² + 10000. A256838

Primes of the form 512·k+1. A76339

Primes of the form 128·k + 1. A208177

Primes of the form 256·k + 1. A208178

Values of A (the short leg) of a Pythagorean triangle with A and C (the hypotenuse) both prime and part of a twin prime. A51642

Prime numbers p of the form 10k+1 for which the quintic polynomial x⁵-x-1 modulus p is factorizable into five binomials. A135842

a(n) = 512·n + 1. A76338

Number of partitions of n in which no parts are multiples of 25. A92885

Prime numbers p for which the quintic polynomial x⁵ - x - 1 modulo p completely factors into linear polynomials. A135844