Properties of the Number 81649

Eighty-One Thousand Six Hundred Forty-Nine

Basics

Value: 81648 → 81649 → 81650

Parity: odd

Prime: Yes

Previous Prime: 81647

Next Prime: 81667

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 81649

Divisors: 1, 81649

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111011110001

Octal: 237361

Duodecimal: 3B301

Hexadecimal: 13ef1

Square: 6666559201

Square Root: 285.7428914251411

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

Balanced primes of order twelve. A96704

Primes of the form 7n² + 1. A201602

Primes of the form (p² - 1)/16 - p, where p is also a prime. A165616

Numbers k such that 20^k - 19^k is prime. A62586

Numbers with two or more digits such that every two consecutive digits are a square. A291334

Primes containing nonprime digits (from 1 to 9) in their decimal expansion and whose digits are distinct, i.e., consisting of only digits 1, 4, 6, 8, 9. A323391

Integers congruent to 0, 1, 4, 9, 16, 25, 36, 49, 64 or 81 (mod 100) which are not squares. A81649