Properties of the Number 81212

Eighty-One Thousand Two Hundred Twelve

Basics

Value: 81211 → 81212 → 81213

Parity: even

Prime: No

Previous Prime: 81203

Next Prime: 81223

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 79 × 257

Divisors: 1, 2, 4, 79, 158, 257, 316, 514, 1028, 20303

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011110100111100

Octal: 236474

Duodecimal: 3ABB8

Hexadecimal: 13d3c

Square: 6595388944

Square Root: 284.9771920698216

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

Number of 1 up, 3 down, 5 up, 7 down, ... permutations of [n]. A227941

First differences of A307632. A348773

a(n) = A348773(2·n). A348775

Let r(n,k) = if k=0 then n else r(A081210(n),k-1), then a(n) = Min{i:r(n,i) = r(n,i+1)}. A81212