Properties of the Number -2685

Six Hundred Eighty-Five

Basics

Value: -2686 → -2685 → -2684

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 179

Divisors: 1, 3, 5, 15, 179, 537, 895, 2685

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001111101

Octal: -5175

Duodecimal: -1679

Hexadecimal: -a7d

Square: 7209225

Square Root: 51.81698563212646

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

Values of n such that L(11) and N(11) are both prime, where L(k) = (n²+n+1)*2^2·k + (2·n+1)*2^k + 1, N(k) = (n²+n+1)*2^k + n. A227449

Expansion of 1/(1+x+x²-2·x³). A77975

Numbers k such that k and k+1 have same sum of divisors. A2961

Numbers k for which (k!-3)/3 is prime. A139056

Expansion of 1/((1+x)*(1-x)⁵). A1752

Numbers k such that k and k+1 have the same sum of unitary divisors (A034448). A64125

Numbers k such that bsigma(k) = bsigma(k+1), where bsigma(k) is the sum of the bi-unitary divisors of k (A188999). A293183

Numbers k such that isigma(k) = isigma(k+1), where isigma(k) is the sum of the infinitary divisors of k (A049417). A306985

Numbers n such that φ(n,x) is a flat cyclotomic polynomial of order three. A117223

Triangle of the normalized A142963 and A156919 sequences. A156920