Properties of the Number 81550

Eighty-One Thousand Five Hundred Fifty

Basics

Value: 81549 → 81550 → 81551

Parity: even

Prime: No

Previous Prime: 81547

Next Prime: 81551

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 5 ² × 7 × 233

Divisors: 1, 2, 5, 7, 10, 14, 25, 35, 50, 70

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111010001110

Octal: 237216

Duodecimal: 3B23A

Hexadecimal: 13e8e

Square: 6650402500

Square Root: 285.5696062258727

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

a(n)=∑_d∣n d·numbpart(d), where numbpart(d)=number of partitions of d, cf. A000041. A61259

Decimal expansion of Sum_1/(2^q-1) with the summation extending over all pairs of integers gcd(p,q) = 1, 0 < p/q < π. A81550

Row sums in A144630. A144632