Properties of the Number 1641

One Thousand Six Hundred Forty-One

Basics

Value: 1640 → 1641 → 1642

Parity: odd

Prime: No

Previous Prime: 1637

Next Prime: 1657

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 547

Divisors: 1, 3, 547, 1641

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11001101001

Octal: 3151

Duodecimal: B49

Hexadecimal: 669

Square: 2692881

Square Root: 40.50925820105819

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

Central polygonal numbers: a(n) = n² - n + 1. A2061

Coordination sequence T1 for Zeolite Code LTA and ρ. A8137

a(n) = ∑_k=1..n n/gcd(n,k). A57660

a(n) = 4·n² - 6·n + 3. A54569

a(n) = least m such that if a/b < c/d where a,b,c,d are integers in [0,n], then a/b < k/m < c/d for some integer k. A1000

Numbers k such that k, k+1 and k+2 are products of two primes. A56809

Numbers k such that k, k+1 and k+2 have the same number of divisors. A5238

Mountain numbers. A134941

Total number of ON cells at stage n of two-dimensional cellular automaton defined by "Rule 750" using the von Neumann neighborhood. A169707

Number of closed walks of length n along the edges of a tetrahedron based at a vertex. A54878