Properties of the Number 81647

Eighty-One Thousand Six Hundred Forty-Seven

Basics

Value: 81646 → 81647 → 81648

Parity: odd

Prime: Yes

Previous Prime: 81637

Next Prime: 81649

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 81647

Divisors: 1, 81647

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111011101111

Octal: 237357

Duodecimal: 3B2BB

Hexadecimal: 13eef

Square: 6666232609

Square Root: 285.7393917540947

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

Smallest number of complexity n: smallest number requiring n 1's to build using + and *. A5520

Primes of the form 16·k-1 such that 4·k-1 and 8·k-1 are also primes. A101793

Primes p such that 7 is the largest of all prime factors of the numbers between p and the next prime (cf. A052248). A80186

Smallest prime that is the sum of 2n+1 cubes of consecutive odd primes. A379760

Primes of the form 7n² - 1. A201793

Primes of the form (k³ - k² - k - 1)/2 for some integer k > 0. A268063

Lesser of twin primes such that the sum of the twin prime pair is the sum of 2 positive cubes. A270244

Numbers m such that Conv(b,m) = b has a unique nontrivial solution (b = 0 and b = 1 are considered trivial solutions). Here, Conv(b,m) denotes the limit of b^^t (mod m) as t goes to infinity. A347561

Sum of next a(n) successive prime cubes is prime. A384161

Integers congruent to 0, 1, 4, 9, 16, 25, 36 or 49 (mod 64) which are not squares. A81647