Properties of the Number 81877

Eighty-One Thousand Eight Hundred Seventy-Seven

Basics

Value: 81876 → 81877 → 81878

Parity: odd

Prime: No

Previous Prime: 81869

Next Prime: 81883

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 41 × 1997

Divisors: 1, 41, 1997, 81877

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111111010101

Octal: 237725

Duodecimal: 3B471

Hexadecimal: 13fd5

Square: 6703843129

Square Root: 286.14157335137446

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 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 63. A31651

Number of permutations σ of [n] such that (σ(k) mod σ(k+1)) <= (σ(k+1) mod σ(k+2)) for 1 <= k <= n - 2. A332800

Square array A(n, k) = A048720(A065621(σ((2n-1)²)), σ((2k-1)²)), read by falling antidiagonals, (1,1), (1,2), (2,1), (1,3), (2,2), (3,1), etc. A379221

Duplicate of A049076. A81877