Properties of the Number -6391

Three Hundred Ninety-One

Basics

Value: -6392 → -6391 → -6390

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 7 × 11 × 83

Divisors: 1, 7, 11, 77, 83, 581, 913, 6391

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1100011110111

Octal: -14367

Duodecimal: -3847

Hexadecimal: -18f7

Square: 40844881

Square Root: 79.94373021069256

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

a(n) = (n+1)*(9-9·n+5·n²-n³). A157371

Hexagonal pyramidal numbers, or greengrocer's numbers. A2412

Expansion of 1/((1-x)⁴*(1+x)). A2623

a(n) = 1*(n) + 2*(n-1) + 3*(n-2) + ... + (n+1-k)*k, where k = floor((n+1)/2). A23855

a(n) = n² written backwards. A2942

Partial sums of A002620. A173196

Floor(X/Y) where X = concatenation of (n+1), (n+2), ...up to 2n and Y = concatenation of 1,2,3,4,... up to n. A67088

Largest possible side length for a perfect squared square of order n; or 0 if no such square exists. A217149

A185128(n) is the a(n)-th triangular number. A185223

Partitions of n with parts having at most 3 distinct magnitudes. A309058