Properties of the Number -2865

Eight Hundred Sixty-Five

Basics

Value: -2866 → -2865 → -2864

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 191

Divisors: 1, 3, 5, 15, 191, 573, 955, 2865

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101100110001

Octal: -5461

Duodecimal: -17A9

Hexadecimal: -b31

Square: 8208225

Square Root: 53.52569476429054

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

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 121", based on the 5-celled von Neumann neighborhood. A270209

a(n) = (n!)*2^n-1*mu_h(n) where mu_h is the hypergeometric Moebius function associated to the Dirichlet character modulo 4 h={1,0,-1,0,1,...} (see comment). A298510

Euler transform of negative integers. A73592

Number of partitions of n in which the least part is even. A26805

Generalized 26-gonal (or icosihexagonal) numbers: m*(12·m - 11) with m = 0, +1, -1, +2, -2, +3, -3, ... A316724

Array read by antidiagonals: T(m,n) is the number of matchings in the stacked prism graph C_m X P_n. A287428

Numbers k such that 6·7^k - 1 is prime. A46866

Number of 8's in all partitions of n. A24792

First partial sums of A048739; second partial sums of A000129. A48776

Integers n such that the 'Reverse and Add!' trajectory of n joins the trajectory of 111. A70798