Properties of the Number -1222221

Two Hundred Twenty-Two Thousand Two Hundred Twenty-One

Basics

Value: -1222222 → -1222221 → -1222220

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 12

Digital Root: 3

Palindrome: Yes

Factorization: 3 × 7 × 11 ² × 13 × 37

Divisors: 1, 3, 7, 11, 13, 21, 33, 37, 39, 77

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100101010011001001101

Octal: -4523115

Duodecimal: -4AB379

Hexadecimal: -12a64d

Square: 1493824172841

Square Root: 1105.5410440141966

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) = n 2's sandwiched between two 1's. A132583

Expansion of g.f. x*(1+10·x)/((1-x)*(1-10·x²)). A94623

Expansion of g.f. x*(1+11·x+x²)/((1-x)*(1+x)*(1-10·x²)). A94624

Numbers which are products of repunits. A308365

Numbers that can be written as a product of distinct repunits. A334131

Numbers n such that the set S(n) = {k: k + reverse(k) = n} is not empty, at least one element of S(n) has the same number of digits as n and at least one element of S(n) has one digit less than n has. A88171

a(n) = 111111·n. A154549

List of privileged words over the alphabet {1,2}. A235609

All possible products in increasing order of two distinct members of the unary sequence 1, 11, 111, 1111, 11111, ...given by A000042. A77488

Palindromes p = A002113(n) whose index n is a substring of p. A248753