Properties of the Number -221841

Two Hundred Twenty-One Thousand Eight Hundred Forty-One

Basics

Value: -221842 → -221841 → -221840

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 157 ²

Divisors: 1, 3, 9, 157, 471, 1413, 24649, 73947, 221841

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110110001010010001

Octal: -661221

Duodecimal: -A8469

Hexadecimal: -36291

Square: 49213429281

Square Root: 471

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

List of pairs of consecutive refactorable numbers. A36898

Determinant of the n X n matrix with (i,j)-entry equal to 1 or 0 according as i + j and 4*(i + j)² + 1 are both prime or not. A228561

The numbers n² as n runs through the numbers which are palindromes in base 2. A192775

Squares whose digits are powers of 2. A272884

Squares which are the concatenation of two or more powers of 2. A392102

Odd squares not in A113659. A103962

Squares s(n) such that cube(n)-square(n)-1 and cube(n)+square(n)+1 are primes. A155931

Squares that become prime numbers when prefixed with an 8. A167723

Number of nX5 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 1 vertically. A207365

Squares whose arithmetic mean of digits is 3 (i.e., the sum of digits is 3 times the number of digits). A316483