Properties of the Number 81848

Eighty-One Thousand Eight Hundred Forty-Eight

Basics

Value: 81847 → 81848 → 81849

Parity: even

Prime: No

Previous Prime: 81847

Next Prime: 81853

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 ³ × 13 × 787

Divisors: 1, 2, 4, 8, 13, 26, 52, 104, 787, 1574

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111110111000

Octal: 237670

Duodecimal: 3B448

Hexadecimal: 13fb8

Square: 6699095104

Square Root: 286.0908946471383

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) = 121·n² + 2·n. A181679

Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 11. A31689

D'Agapeyeff cipher. A135209

Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101. A260919

Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101. A260925

Numbers k such that (10^k + 77)/3 is prime. A281303

Number of numbers whose base-3/2 expansion (see A024629) has n digits. A81848

T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101. A260927

Square array A(n, k) = A329644(prime(n)^k), read by falling antidiagonals: (1,1), (1,2), (2,1), (1,3), (2,2), (3,1), ... A329637