Properties of the Number 81025

Eighty-One Thousand Twenty-Five

Basics

Value: 81024 → 81025 → 81026

Parity: odd

Prime: No

Previous Prime: 81023

Next Prime: 81031

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 ² × 7 × 463

Divisors: 1, 5, 7, 25, 35, 175, 463, 2315, 3241, 11575

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110010000001

Octal: 236201

Duodecimal: 3AA81

Hexadecimal: 13c81

Square: 6565050625

Square Root: 284.64890654980564

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

Second class of all proper positive solutions y2(n) = a(n) of the Pell equation x² - 7·y² = 9. A307173

a(1)=1, a(n) = a(n-1) + n⁵ if n odd, a(n) = a(n-1) + n³ if n is even. A135099

1/4 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 25. A159225

First class of all proper positive solutions x1(n) = a(n) of the Pell equation x² - 7·y² = 9. A307168

Variation on Ulam numbers: a(1) = 1; a(2) = 2; for n>2, a(n) is smallest (n odd) or largest (n even) new number that is the sum of two distinct earlier terms. A81025