Properties of the Number 31812

Thirty-One Thousand Eight Hundred Twelve

Basics

Value: 31811 → 31812 → 31813

Parity: even

Prime: No

Previous Prime: 31799

Next Prime: 31817

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 11 × 241

Divisors: 1, 2, 3, 4, 6, 11, 12, 22, 33, 44

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111110001000100

Octal: 76104

Duodecimal: 164B0

Hexadecimal: 7c44

Square: 1012003344

Square Root: 178.35918815693236

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 digits of σ(k) are a permutation of those of k, in base 10. A115920

Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 529", based on the 5-celled von Neumann neighborhood. A282917

Eighth column (k=7) of septinomial array A063265. A63267

Number of nonseparable rooted toroidal maps with n + 3 edges and n + 1 vertices. A6408

Expansion of ∏_m>=1 1/(1 + m·q^m)⁶. A22698

a(n) is the smallest number representable in exactly n ways as a sum of 2 palindromes (each of them >= 0). A115336

a(n) = (25·n + 41)*Pochhammer(n, 5) / 6!. A293611

T(2n,n+1), where T is the array defined in A026082. A26093

Array of generalized Eulerian number triangles read by ascending antidiagonals, with m >= 0, n >= 0 and 0 <= k <= n. A293616

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 44 ones. A31812