Properties of the Number 2669

Two Thousand Six Hundred Sixty-Nine

Basics

Value: 2668 → 2669 → 2670

Parity: odd

Prime: No

Previous Prime: 2663

Next Prime: 2671

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 17 × 157

Divisors: 1, 17, 157, 2669

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001101101

Octal: 5155

Duodecimal: 1665

Hexadecimal: a6d

Square: 7123561

Square Root: 51.66236541235796

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

Odd numbers not of form p + 2^k (de Polignac numbers). A6285

Number of refinement-ordered pairs of strict integer partitions of n. A317142

a(n) = (2·n-1)*(13·n²-13·n+6)/6. A63493

a(n) = a(n-1) + a(n-2) + a(n-3), with a(0) = 1, a(1) = a(2) = 5. A214827

T(n,k) is the number of n X k 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. A279977

a(n) = 3·n² - n - 1. A144390

T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 2 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302623

Numbers k such that 4·k! - 1 is prime. A99350

Numbers k such that 8·k! + 1 is prime. A178488

Numbers of the form 9·m² + 4·m, m an integer. A185039