Properties of the Number 31666

Thirty-One Thousand Six Hundred Sixty-Six

Basics

Value: 31665 → 31666 → 31667

Parity: even

Prime: No

Previous Prime: 31663

Next Prime: 31667

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 71 × 223

Divisors: 1, 2, 71, 142, 223, 446, 15833, 31666

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101110110010

Octal: 75662

Duodecimal: 163AA

Hexadecimal: 7bb2

Square: 1002735556

Square Root: 177.9494310190398

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) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n - 1 <= 2^p+1, starting with a(1) = a(2) = 1 and a(3) = 3. A49894

Denominators of continued fraction convergents to sqrt(558). A42069

a(n) = A077706(n+1)/A077706(n). A77707

Least m such that reverse(σ(m)) = σ(m+n). A71813

Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,0 3,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. A155262

Number of 3 X n 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. A281328

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 78. A31666