Properties of the Number -15813

Fifteen Thousand Eight Hundred Thirteen

Basics

Value: -15814 → -15813 → -15812

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 7 × 251

Divisors: 1, 3, 7, 9, 21, 63, 251, 753, 1757, 2259

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -11110111000101

Octal: -36705

Duodecimal: -9199

Hexadecimal: -3dc5

Square: 250050969

Square Root: 125.74975149080812

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

Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p that are < p/2. A282039

Triangle read by rows: T(n,k) = number of peakless Motzkin paths of length n containing k subwords of the type uh^ju, dH^jd, or dh^ju for some j>0, where u=(1,1), d=(1,-1) and h=(1,0) (can be easily expressed using RNA secondary structure terminology). A98056

Numbers k such that there is a number m < k satisfying A000203(k) = A000203(m) = m + k - gcd(m,k). A124141

Numbers k such that 6!*(2·k-7)!/(k!*(k-1)!) is an integer. A4786

Number of n X n arrays of squares of integers summing to 4 with every element equal to at least one neighbor. A146089

Numbers k such that 7!*(2k-8)!/(k!*(k-1)!) is an integer. A4787