Properties of the Number 81289

Eighty-One Thousand Two Hundred Eighty-Nine

Basics

Value: 81288 → 81289 → 81290

Parity: odd

Prime: No

Previous Prime: 81283

Next Prime: 81293

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 13 ³ × 37

Divisors: 1, 13, 37, 169, 481, 2197, 6253, 81289

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110110001001

Octal: 236611

Duodecimal: 3B061

Hexadecimal: 13d89

Square: 6607901521

Square Root: 285.112258592997

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

Numbers m > 1 such that every prime divisor p of m satisfies s_p(m) = p. A324458

a(n) = (a(n-1)*a(n-3) - a(n-2)²) / a(n-4), with a(0) = 0, a(1) = a(2) = a(3) = 1, a(4) = -1. A50512

Integers k such that k² can be written as the sum of three positive fourth powers. A365657

Table read by antidiagonals: T(n,k) is the number of strings of numbers x(i=1..n) in 0..k with sum i⁴*x(i) equal to n⁴*k. A184348

a(0) = 0, a(n) = A081293(A081288(n)-1). A81289

Number of length 5+1 0..n arrays with the sum of the minimum of each adjacent pair multiplied by some arrangement of +-1 equal to zero. A250422