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Properties of the Number 2191

Two Thousand One Hundred Ninety-One

Basics

Value: 2190 → 2191 → 2192

Parity: odd

Prime: No

Previous Prime: 2179

Next Prime: 2203

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 7 × 313

Divisors: 1, 7, 313, 2191

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100010001111

Octal: 4217

Duodecimal: 1327

Hexadecimal: 88f

Square: 4800481

Square Root: 46.8081189538738

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 necklaces of sets of beads containing a total of n beads. A8965
Triangle of Mahonian numbers T(n,k): coefficients in expansion of ∏i=0..n-1 (1 + x + ... + xi), where k ranges from 0 to A000217(n-1). Also enumerates permutations by their major index. A8302
a(n)-th and (a(n)+1)-st primes are the first pair of primes that differ by exactly 2n; a(n) = -1 if no such pair of primes exists. A38664
Number of corners, or planar partitions of n with only one row and one column. A6330
Numbers k such that 2k + 3 is prime. A57732
Total number of ON states after n generations of cellular automaton based on hexagons. A151723
Numbers that are the sum of 7 positive 6th powers. A3363
Numbers that are the sum of 5 positive 7th powers. A3372
Generalized 23-gonal (or icositrigonal) numbers: m*(21·m - 19)/2 with m = 0, +1, -1, +2, -2, +3, -3, ... A303303
Coordination sequence for (3,3,6) tiling of hyperbolic plane. A265073