Properties of the Number 2641

Two Thousand Six Hundred Forty-One

Basics

Value: 2640 → 2641 → 2642

Parity: odd

Prime: No

Previous Prime: 2633

Next Prime: 2647

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 19 × 139

Divisors: 1, 19, 139, 2641

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001010001

Octal: 5121

Duodecimal: 1641

Hexadecimal: a51

Square: 6974881

Square Root: 51.39066063011839

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

Centered pentagonal numbers: (5n²+5n+2)/2; crystal ball sequence for 3.3.3.4.4. planar net. A5891

First spoke of a hexagonal spiral. A56105

Expansion of ∏_m>=1 (1+q^m)^m². A27998

Integers of the form m*(m + 6)/7. A274978

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

a(n) = n*(n²+3·n-1)/3. A84990

Smallest of three consecutive squarefree numbers k, k+1, k+2 of the form p·q where p and q are distinct primes. A39833

Pseudo-squares: a(n) = the least nonsquare positive integer which is 1 mod 8 and is a (nonzero) quadratic residue modulo the first n odd primes. A2189

Expansion of 1/sqrt(1 - 10·x + x²). A6442

Concentric 20-gonal numbers. A195148