Properties of the Number 81050

Eighty-One Thousand Fifty

Basics

Value: 81049 → 81050 → 81051

Parity: even

Prime: No

Previous Prime: 81049

Next Prime: 81071

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 × 5 ² × 1621

Divisors: 1, 2, 5, 10, 25, 50, 1621, 3242, 8105, 16210

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011110010011010

Octal: 236232

Duodecimal: 3AAA2

Hexadecimal: 13c9a

Square: 6569102500

Square Root: 284.6928169097352

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 m such that 72·m + 1, 576·m + 1, 648·m + 1, 1296·m + 1, and 2592·m + 1 are all primes. A372187

a(n) is the total number of elements in all sum-free subsets of {1,...,n}. A288888

Numbers k such that k-1, k-3, k-7 and k-9 are all prime. A64974

Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 18. A31606

Smallest k such that A073259(k)=n or 0 if there is no such value; the first number of which length of fixed-point-list terminated by k-th composite number equals n. A73323

a(n) = (n! - Stirling1(n+1, 2))*(-1)ⁿ where Stirling1 is A048994. A81050