Properties of the Number 43721

Forty-Three Thousand Seven Hundred Twenty-One

Basics

Value: 43720 → 43721 → 43722

Parity: odd

Prime: Yes

Previous Prime: 43717

Next Prime: 43753

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 43721

Divisors: 1, 43721

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010101011001001

Octal: 125311

Duodecimal: 21375

Hexadecimal: aac9

Square: 1911525841

Square Root: 209.0956718825141

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

Perrin sequence (or Perrin numbers, or Ondrej Such sequence): a(n) = a(n-2) + a(n-3) with a(0) = 3, a(1) = 0, a(2) = 2. A1608

Primes p such that q-p = 32, where q is the next prime after p. A126784

a(n) = a(n-1) + a(n-2) + a(n-4). A259967

Prime numbers in the Perrin sequence b(n+1) = b(n-1) + b(n-2) with initial values b(1)=3, b(2)=0, b(3)=2. A74788

Expansion of ( 2+x+2·x² ) / ( 1-2·x+x²-x³ ). A109377

a(n) = round(rⁿ) where r is the smallest Pisot number (real root r=1.3247179.. of x³-x-1). A205579

Primes that can be constructed by concatenating two squares >= 4. A345314

Primes p such that 2·p+1 and (2·p)²+(2·p+1)² are also prime. A347110

Numbers k such that the continued fraction for sqrt(k) has period 79. A20418

a(n) = floor(rⁿ) where r is the smallest Pisot number (real root r=1.3247179... of x³-x-1). A112639