Properties of the Number 81671

Eighty-One Thousand Six Hundred Seventy-One

Basics

Value: 81670 → 81671 → 81672

Parity: odd

Prime: Yes

Previous Prime: 81667

Next Prime: 81677

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 81671

Divisors: 1, 81671

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111100000111

Octal: 237407

Duodecimal: 3B31B

Hexadecimal: 13f07

Square: 6670152241

Square Root: 285.78138497809823

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

Indices of prime Lucas numbers. A1606

Primes of the form 3·m² - 4. A201716

Numbers k such that floor(φ^k) is prime, where φ is the golden ratio. A59791

Primes p such that floor(φ^p) is prime. A168033

Number of partitions of n with up to six distinct kinds of 1. A320693

Numbers n such that n-th Lucas number is prime, but cannot be written in the form a² + 10·b². A216576

Smallest prime in kx³+x+5 is prime. A114369

Numbers n such that the n-th Lucas number is prime and can be written in the form a² + 7·b². A216537

Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a² + 3·b². A216555

Numbers n such that the n-th Lucas number is prime and can be written in the form a² + 2·b². A216562