Properties of the Number -5221

Two Hundred Twenty-One

Basics

Value: -5222 → -5221 → -5220

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 23 × 227

Divisors: 1, 23, 227, 5221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

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Representations

Binary: -1010001100101

Octal: -12145

Duodecimal: -3031

Hexadecimal: -1465

Square: 27258841

Square Root: 72.2564875980005

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

Numerators of the expansion of -W_-1(-e^{-1 - x²/2}) where x > 0 and W_-1 is the Lambert W function. A5447

Numerators of coefficients in S(x) where: C(x)^1/2 - S(x)^1/2 = 1 such that C'(x)*S(x)^1/2 = S'(x)*C(x)^1/2 = 2·x*C(x). A299432

Numerators of SGGS((2·n+1)/2ⁿ⁺¹) where the rational numbers SGGS(n) are defined in A264148. A264150

Heptagonal numbers (or 7-gonal numbers): n*(5·n-3)/2. A566

Centered 12-gonal numbers, or centered dodecagonal numbers: numbers of the form 6·k*(k-1) + 1. A3154

a(n) = 4·n² - 7·n + 4. A54567

Generalized 21-gonal (or icosihenagonal) numbers: m*(19·m - 17)/2 with m = 0, +1, -1, +2, -2, +3, -3, ... A303298

a(n) = n² written backwards. A2942

Numbers k such that k² is palindromic in base 4. A29986

T(n,k) = number of 0..k arrays x(0..n-1) of n elements with zero (n-1)-st difference. A200154