Properties of the Number 1881

One Thousand Eight Hundred Eighty-One

Basics

Value: 1880 → 1881 → 1882

Parity: odd

Prime: No

Previous Prime: 1879

Next Prime: 1889

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

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

Number of T₀ integer partitions of n. A319564

Number of distinct products i·j*k with 1 <= i < j < k <= n. A27430

Number of incomplete strict integer partitions of n, meaning not every number from 0 to n is the sum of some submultiset. A365831

Strobogrammatic numbers: the same upside down. A787