Properties of the Number 81286

Eighty-One Thousand Two Hundred Eighty-Six

Basics

Value: 81285 → 81286 → 81287

Parity: even

Prime: No

Previous Prime: 81283

Next Prime: 81293

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 97 × 419

Divisors: 1, 2, 97, 194, 419, 838, 40643, 81286

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110110000110

Octal: 236606

Duodecimal: 3B05A

Hexadecimal: 13d86

Square: 6607413796

Square Root: 285.10699745884875

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 k that divide 5^k - 3. A123061

The number of NE partitions of n (see Comments). A239329

For n<=11, a(n) = n mod 10. For even n>11, a(n) = (2a(n-1)+1) mod 10. For odd n>11, a(n) = (a(n-1)+a(i+1)) mod 10, where i is the largest integer < n-1 such that a(i)=a(n-1). A81286