Properties of the Number -9821

Eight Hundred Twenty-One

Basics

Value: -9822 → -9821 → -9820

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 7 × 23 × 61

Divisors: 1, 7, 23, 61, 161, 427, 1403, 9821

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10011001011101

Octal: -23135

Duodecimal: -5825

Hexadecimal: -265d

Square: 96452041

Square Root: 99.10095862301232

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

Values of n such that L(18) and N(18) are both prime, where L(k) = (n²+n+1)*2^2·k + (2·n+1)*2^k + 1, N(k) = (n²+n+1)*2^k + n. A227521

Arrange digits of 2ⁿ in descending order. A28910

a(n) is the first of a triple of consecutive integers, each of which is the product of three distinct primes. A66509

Numbers n such that 2·10ⁿ + 3 is prime. A81677

Numbers n such that n!8 + 2 is prime. A204663

Average of terms of n-th row of A077321. A77325

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of B(x)^k, where B(x) is the g.f. of A384145. A384652

Triangle read by rows: T(n,k) is the number of non-equivalent regular polygons with n+1 edges, one of which is rooted, which are dissected by non-intersecting diagonals into k regions, such that two such polygons are identified up to reflection along the rooted edge and twisting along the diagonals that does not affect the root edge (for 1 <= k <= n-1 and n >= 2). A232206

Odd numbers seen in decimal expansion of π (disregarding the decimal period) contiguous, smallest and distinct. A50817

Numbers n such that 11ⁿ is the highest power of 11 dividing A240751(n). A286006