Properties of the Number -921

Nine Hundred Twenty-One

Basics

Value: -922 → -921 → -920

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 307

Divisors: 1, 3, 307, 921

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1110011001

Octal: -1631

Duodecimal: -649

Hexadecimal: -399

Square: 848241

Square Root: 30.347981810987037

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

Deficiency of prime-shifted squares: a(n) = 2·A003961(n²) - σ(A003961(n²)), where A003961 is fully multiplicative function with a(prime(i)) = prime(i+1). A378231

Expansion of 1/(1+x+x²+2·x³). A77976

Expansion of ∏_k>=1 (1-x^k²)^k². A291696

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 133", based on the 5-celled von Neumann neighborhood. A270235

Number of inseparable partitions of n; see Comments. A325535

Number of partitions of n into distinct parts for which (number of odd parts) = (number of even parts). A239241

Numbers that are the sum of 9 positive 5th powers. A3354

Number of integer partitions of n such that the greatest part is the unique mode. A362612

Numbers m such that the Bernoulli number B_2·m has denominator 42. A51227

Numbers that are the sum of 4 positive 6th powers. A3360