Properties of the Number -1881

Eight Hundred Eighty-One

Basics

Value: -1882 → -1881 → -1880

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: Yes

Factorization: 3 ² × 11 × 19

Divisors: 1, 3, 9, 11, 19, 33, 57, 99, 171, 209

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11101011001

Octal: -3531

Duodecimal: -1109

Hexadecimal: -759

Square: 3538161

Square Root: 43.37049688440288

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(9) and N(9) 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. A226929

Sequence is {a(6,n)}, where a(m,n) is defined at sequence A110665. A110671

Expansion of 1/((1-x)*(1+x+2·x²-x³)). A77911

Triangle of coefficients, read by row polynomials P_n(y), that satisfy the g.f.: A096651(x,y) = ∏_n>=1 1/(1-xⁿ)^[P_n(y)/n], with P_n(0)=0 for n>=1. A96800

Number of different products of partitions of n; number of partitions of n into prime parts (1 included); number of distinct orders of Abelian subgroups of symmetric group S_n. A34891

Generalized 12-gonal numbers: k*(5·k-4) for k = 0, +-1, +-2, ... A195162

Sum of all parts of the last section of the set of partitions of n. A138879

Coordination sequence for "cab" 3D uniform tiling formed from octahedra and truncated cubes. A299266

Triangle P, read by rows, such that P² transforms column k of P into column k+1 of P, so that column k of P equals column 0 of P^2·k+1, where P² denotes the matrix square of P. A113340

a(1)=1, a(n)=a(n-1)+n if n even, a(n)=a(n-1)+n² if n is odd. A136047