Properties of the Number -2689

Six Hundred Eighty-Nine

Basics

Value: -2690 → -2689 → -2688

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2689

Divisors: 1, 2689

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101010000001

Octal: -5201

Duodecimal: -1681

Hexadecimal: -a81

Square: 7230721

Square Root: 51.85556864985669

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

The real part of complex sequence: a(n) = a(n-1) + (1+i)*a(n-2). A143055

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 145", based on the 5-celled von Neumann neighborhood. A270289

Primes of the form x² + 24·y². A107008

Primes of the form x² + 45y². A107152

Primes of the form x² + 40y². A107145

Primes of the form 16n+1. A94407

Prime numbers congruent to 1 modulo 16 representable by both x² + 32·y² and x² + 64·y². A325067

Proth primes: primes of the form k·2^m + 1 with odd k < 2^m, m >= 1. A80076

Primes p such that p + 4 is prime and p == 9 (mod 10). A74822

Balanced primes of order twelve. A96704