Properties of the Number 81739

Eighty-One Thousand Seven Hundred Thirty-Nine

Basics

Value: 81738 → 81739 → 81740

Parity: odd

Prime: No

Previous Prime: 81737

Next Prime: 81749

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 7 × 11677

Divisors: 1, 7, 11677, 81739

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111101001011

Octal: 237513

Duodecimal: 3B377

Hexadecimal: 13f4b

Square: 6681264121

Square Root: 285.9003322838223

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

One of the two successive approximations up to 2ⁿ for 2-adic integer sqrt(-7). This is the 3 (mod 4) case. A318961

Numerators of Integral_x=0..1 P(n, x)³ with P(n, x) = ∑_k=0..n (-1)^n-k* Stirling2(n, k)*k!*x^k. A291449

Numbers k such that 399·2^k+1 is prime. A323044

a(n) = (-1/2ⁿ)*(A000367(2ⁿ)+1). A81739