Properties of the Number 650

Six Hundred Fifty

Basics

Value: 649 → 650 → 651

Parity: even

Prime: No

Previous Prime: 647

Next Prime: 653

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 × 5 ² × 13

Divisors: 1, 2, 5, 10, 13, 25, 26, 50, 65, 130

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010001010

Octal: 1212

Duodecimal: 462

Hexadecimal: 28a

Square: 422500

Square Root: 25.495097567963924

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

Oblong (or promic, pronic, or heteromecic) numbers: a(n) = n*(n+1). A2378

Square pyramidal numbers: a(n) = 0² + 1² + 2² + ... + n² = n*(n+1)*(2·n+1)/6. A330

Quarter-squares: a(n) = floor(n/2)*ceiling(n/2). Equivalently, a(n) = floor(n²/4). A2620

Sum of totient function: a(n) = ∑_k=1..n φ(k), cf. A000010. A2088

a(n) = binomial(n+3, 3)/4 for odd n, n*(n+2)*(n+4)/24 for even n. A6918

a(n) = 2·n*(2·n-1). A2939

Arithmetic derivative of the primorial base exp-function: a(n) = A003415(A276086(n)). A327860

Number of points on surface of tetrahedron; coordination sequence for sodalite net (equals 2·n²+2 for n > 0). A5893

Numbers whose ternary expansion contains no 1's. A5823

Primitive abundant numbers: abundant numbers (A005101) having no abundant proper divisor. A91191