Properties of the Number 81770

Eighty-One Thousand Seven Hundred Seventy

Basics

Value: 81769 → 81770 → 81771

Parity: even

Prime: No

Previous Prime: 81769

Next Prime: 81773

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 × 5 × 13 × 17 × 37

Divisors: 1, 2, 5, 10, 13, 17, 26, 34, 37, 65

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111101101010

Octal: 237552

Duodecimal: 3B3A2

Hexadecimal: 13f6a

Square: 6686332900

Square Root: 285.9545418418809

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 are the hypotenuse of exactly 40 distinct integer-sided right triangles, i.e., k² can be written as a sum of two squares in 40 ways. A97282

Least number having n orderless representations as p² + q², where p and q are primes. A214511

Numbers that are the sum of 2 nonzero squares in 7 or more ways. A25298

Numbers that are the sum of 2 nonzero squares in 8 or more ways. A25299

Numbers that are the sum of 2 distinct nonzero squares in 7 or more ways. A25317

Numbers that are the sum of 2 distinct nonzero squares in 8 or more ways. A25318

Numbers that are the sum of 2 nonzero squares in exactly 8 ways. A25291

Smallest number having exactly n representations as sum of two squares of distinct primes. A88919

Numbers k such that sum(d∣k, σ(d)²) is a multiple of k. A226563

Partial sums of sequence {1/(i²+1): i=0..n} (denominators). A33468