Properties of the Number 654

Six Hundred Fifty-Four

Basics

Value: 653 → 654 → 655

Parity: even

Prime: No

Previous Prime: 653

Next Prime: 659

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 109

Divisors: 1, 2, 3, 6, 109, 218, 327, 654

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010001110

Octal: 1216

Duodecimal: 466

Hexadecimal: 28e

Square: 427716

Square Root: 25.573423705088842

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

Triangle read by rows: T(n,k) is the number of compositions of n into nonzero parts with k parts directly followed by a different part, n>=0, 0<=k<=A004523(n-1). A238279

Triangle read by rows: T(n,k) is the number of compositions into nonzero parts with k parts directly followed by a different part, n>=0, 0<=k<=n. A238130

Smith (or joke) numbers: composite numbers k such that sum of digits of k = sum of digits of prime factors of k (counted with multiplicity). A6753

Numbers whose ternary expansion contains no 1's. A5823

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

G.f.: ∏_k>=1 (1 + 2·x^k). A32302

Admirable numbers. A number n is admirable if there exists a proper divisor d' of n such that σ(n)-2d'=2n, where σ(n) is the sum of all divisors of n. A111592

Number of dissections of a convex (n+2)-gon into triangles and quadrilaterals by nonintersecting diagonals. A1002

Unitary abundant numbers: numbers k such that usigma(k) > 2·k. A34683

Numbers n such that n¹⁰ + n⁹ + n⁸ + n⁷ + n⁶ + n⁵ + n⁴ + n³ + n² + n + 1 is prime. A162862