Properties of the Number 12861

Twelve Thousand Eight Hundred Sixty-One

Basics

Value: 12860 → 12861 → 12862

Parity: odd

Prime: No

Previous Prime: 12853

Next Prime: 12889

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 1429

Divisors: 1, 3, 9, 1429, 4287, 12861

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 11001000111101

Octal: 31075

Duodecimal: 7539

Hexadecimal: 323d

Square: 165405321

Square Root: 113.4063490286148

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

Number of separable partitions of n; see Comments. A325534

The number of pairs of permutations in the product group S_n X S_n with k common descents, n >= 1 and 0 <= k <= n-1. A192721

T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly one way, and new values 0..1 introduced in row major order. A204492

Triangle read by rows: T(n,k) is the number of configurations with exactly k polyomino matchings in a generalized game of memory played on the path of length 3n. A334056

Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 534", based on the 5-celled von Neumann neighborhood. A288983

Consecutive states of the linear congruential pseudo-random number generator 172·s mod 30307 when started at s=1. A385032

G.f.: ∏_m>0 1/(1 - x^m + 2!*x^2·m). A293294

Odd composite integers m such that A006497(3·m-J(m,13)) == 11·J(m,13) (mod m), where J(m,13) is the Jacobi symbol. A339725

Numbers k such that k! + (k+1)! + 1 is prime. A87147

Triangle of numbers C⁷(n,k) of combinations with repetitions from n different elements over k for each of them not more than 7 appearances allowed. A213808