Properties of the Number 81249

Eighty-One Thousand Two Hundred Forty-Nine

Basics

Value: 81248 → 81249 → 81250

Parity: odd

Prime: No

Previous Prime: 81239

Next Prime: 81281

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 53 × 73

Divisors: 1, 3, 7, 21, 53, 73, 159, 219, 371, 511

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10011110101100001

Octal: 236541

Duodecimal: 3B029

Hexadecimal: 13d61

Square: 6601400001

Square Root: 285.0421021533486

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

Trimorphic numbers: n³ ends with n. Also m-morphic numbers for all m > 5 such that m-1 is not divisible by 10 and m == 3 (mod 4). A33819

a(n) = (2·5^2ⁿ - 1) mod 10ⁿ: a sequence of trimorphic numbers ending in 9. A224473

a(n) = floor(log(n)*2ⁿ/n). A65613

a(n) = round(log(n)*2ⁿ/n). A65614

Numbers n with k digits such that n² == 1 (mod 10^k). A181607

Trimorphic but not bimorphic nor automorphic. A56032

Numbers n such that the product of proper divisors of n ends with n and n is not a multiplicatively perfect number (A007422). A278474

Partial sums of A081134. A81249

a(n) = a(floor(n/a(n-1))) + a(floor(n/a(n-2))) with a(1) = a(2) = 2. A283207