Properties of the Number 1649

One Thousand Six Hundred Forty-Nine

Basics

Value: 1648 → 1649 → 1650

Parity: odd

Prime: No

Previous Prime: 1637

Next Prime: 1657

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 17 × 97

Divisors: 1, 17, 97, 1649

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11001110001

Octal: 3161

Duodecimal: B55

Hexadecimal: 671

Square: 2719201

Square Root: 40.607881008493905

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

a(n) = (n³ + 2·n)/3. A6527

Generalized 14-gonal numbers: m*(6·m-5), m = 0,+1,-1,+2,-2,+3,-3,... A195818

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

14-gonal (or tetradecagonal) numbers: a(n) = n*(6·n-5). A51866

a(n) = A005449(n) - 1, where A005449 = second pentagonal numbers. A95794

a(n) = (2·n+1)*(4·n²+4·n+3)/3. A57813

In base-10 notation replace digits of n with their squared values (Version 1). A48385

Global ranks of terms of A057122: tells which terms of A014486 form rooted plane binary trees also when interpreted as codes for ordinary rooted planar trees. A57123

Leyland numbers: 3, together with numbers expressible as n^k + kⁿ nontrivially, i.e., n,k > 1 (to avoid n = (n-1)¹ + 1^n-1). A76980

G.f.: ∏_k>=1 (1+x^k)^2·k-1. A255835