Properties of the Number 81325

Eighty-One Thousand Three Hundred Twenty-Five

Basics

Value: 81324 → 81325 → 81326

Parity: odd

Prime: No

Previous Prime: 81307

Next Prime: 81331

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 ² × 3253

Divisors: 1, 5, 25, 3253, 16265, 81325

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110110101101

Octal: 236655

Duodecimal: 3B091

Hexadecimal: 13dad

Square: 6613755625

Square Root: 285.17538463198395

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

The sum of the numbers on straight lines of incrementing length n when drawn over numbers of the square spiral, where each line contains numbers which sum to the minimum possible value, and each number on the spiral can only be in one line. If two or more lines exist with the same sum the one containing the smallest number is chosen. A340974

Maximal term of TRIP-Stern sequence of level n corresponding to permutation triple (e,132,e). A271489

Expansion of (1+x)/(1-2x-x²-x³). A116413

Expansion of (1-x)/(1+2·x-x²+x³). A78058

Number of distinct finite languages over binary alphabet, whose minimum regular expression has reverse Polish length 2n-1. A211942

a(n) = σ(n²) modulo 4. A81325

O.g.f. A(x) satisfies: [xⁿ] exp( n·x*A(x) ) * (n+1 - n·A(x)) = 0 for n >= 1. A317338