Properties of the Number 80657

Eighty Thousand Six Hundred Fifty-Seven

Basics

Value: 80656 → 80657 → 80658

Parity: odd

Prime: Yes

Previous Prime: 80651

Next Prime: 80669

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 80657

Divisors: 1, 80657

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011101100010001

Octal: 235421

Duodecimal: 3A815

Hexadecimal: 13b11

Square: 6505551649

Square Root: 284.0017605579233

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 81·k² - 72·k + 17. A154276

a(n) = 81·n² - 72·n + 17. A154277

Honaker primes of the form k² + 1. A176790

Primes of the form p² + 2·p + 2 where p is prime. A157467

Values of terms in A380837 which are not in A379066. A380838

Primes p such that (p-1) and the period length of 1/p are both squares. A76516

Primes p such that gcd(φ(p-1), σ(p-1)) = 1 with φ = A000010, σ = A000203. A270539

Primes from twin primes by taking the factorial of each digit and adding them up. A165934

Duplicate of A075152. A80657

Numbers k such that 1021·k + 1019 is prime. A107072