Properties of the Number 81769

Eighty-One Thousand Seven Hundred Sixty-Nine

Basics

Value: 81768 → 81769 → 81770

Parity: odd

Prime: Yes

Previous Prime: 81761

Next Prime: 81773

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 81769

Divisors: 1, 81769

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10011111101101001

Octal: 237551

Duodecimal: 3B3A1

Hexadecimal: 13f69

Square: 6686169361

Square Root: 285.95279330686736

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

Prime(k), where k is such that (1 + ∑_i=1..k prime(i)²) / k is an integer. A233862

Primes of the form 2·n² + 46·n + 21. A217495

Number of polyhedra formed when an n-antiprism, formed from two n-sided regular polygons joined by 2n adjacent alternating triangles, is internally cut by all the planes defined by any three of its vertices. A338806

G.f.: x*(1-x²)*(x⁴+x³-x²+x+1) / (x⁸-4·x⁶-x⁴-4·x²+1). A5822

Primes of the form p³ + q² + r, where p, q, r are consecutive primes. A258269

Number of Dyck paths of semilength n with strongly unimodal peak heights such that neighboring peaks differ in height by exactly one and first and last peak are at height one. A371926

Numbers k such that A334943(k) = 1. A335773

a(n)-th term of the continued fraction for 2*∑_k>=0 1/2^{2^k} is 2. A81769