Properties of the Number -128557

One Hundred Twenty-Eight Thousand Five Hundred Fifty-Seven

Basics

Value: -128558 → -128557 → -128556

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 11 × 13 × 29 × 31

Divisors: 1, 11, 13, 29, 31, 143, 319, 341, 377, 403

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11111011000101101

Octal: -373055

Duodecimal: -62491

Hexadecimal: -1f62d

Square: 16526902249

Square Root: 358.5484625542271

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) = (F(3·n+2) - 1)/4, where F=A000045 (the Fibonacci sequence). A49652

Number of permutations satisfying -k <= p(i) - i <= r and p(i) - i not in I, i=1..n, with k=1, r=5, I={1,3}. A79962

a(n) appears in the congruences modulo 4 or 32 of Markoff numbers m(n) = A002559(n) for odd or even m(n). A309376

a(n) = floor(Fibonacci(n)/4). A4697

a(n) = a(n-1) + a(n-2) + 1 if n is a multiple of 6, otherwise a(n) = a(n-1) + a(n-2). A131132

Lower Beatty array of the golden ratio, (1+sqrt(5))/2. A181886

Number of maximal irredundant sets in the n-Andrásfai graph. A291053

a(n) = smallest k such that the digit sum of 7k is n. A77494

a(n) is the integer k that minimizes |k/Fibonacci(n) - 1/4|. A293553

a(n) = ceiling(n*φ¹⁷), where φ is the golden ratio, A001622. A4972