Properties of the Number -221648

Two Hundred Twenty-One Thousand Six Hundred Forty-Eight

Basics

Value: -221649 → -221648 → -221647

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ⁴ × 7 × 1979

Divisors: 1, 2, 4, 7, 8, 14, 16, 28, 56, 112

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110110000111010000

Octal: -660720

Duodecimal: -A8328

Hexadecimal: -361d0

Square: 49127835904

Square Root: 470.79507219171273

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

Let r, s, t, u be four permutations of the set { 1, 2, 3, ..., n }; a(n) = minimal value of ∑_i=1..n r(i)*s(i)*t(i)*u(i). A70736

E.g.f.: A(x) = ∑_n>=0 2ⁿ/n!*∏_k=0..n-1 L(2^k*x), where L(x) is the e.g.f. of A177777. A177778