Properties of the Number -217242

Two Hundred Seventeen Thousand Two Hundred Forty-Two

Basics

Value: -217243 → -217242 → -217241

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ⁶ × 149

Divisors: 1, 2, 3, 6, 9, 18, 27, 54, 81, 149

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -110101000010011010

Octal: -650232

Duodecimal: -A5876

Hexadecimal: -3509a

Square: 47194086564

Square Root: 466.09226554406587

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

Numbers k whose bi-unitary divisors have an even sum which is larger than 2k, but they cannot be partitioned into two disjoint parts whose sums are equal. A323342

a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 0, s(2n) = n. Also a(n) = T(2n,n), where T is the array in A026300. A26302

a(n) = binomial(n, n/2 - 1/4 + (-1)ⁿ/4)*hypergeom([-n/4 - 1/8 + (-1)ⁿ/8, -n/4 + 3/8 + (-1)ⁿ/8], [n/2 + 7/4 + (-1)ⁿ/4], 4). A344394

a(n) = T(n,[ n/2 ]), where T is the array in A026300. A26307