Properties of the Number -1771

Seven Hundred Seventy-One

Basics

Value: -1772 → -1771 → -1770

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 16

Digital Root: 7

Palindrome: Yes

Factorization: 7 × 11 × 23

Divisors: 1, 7, 11, 23, 77, 161, 253, 1771

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: Yes

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Representations

Binary: -11011101011

Octal: -3353

Duodecimal: -1037

Hexadecimal: -6eb

Square: 3136441

Square Root: 42.08325082500163

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

Expansion of (1-x-x^N)/((1-x)(1-x²)(1-x³)...(1-x^N)) for N = 7. A60026

Expansion of (∏_j>=1 (1-(-x)^j) - 1)²³ in powers of x. A47648

Riordan array (1/(1+x)³, x/(1+x)³). A127895

Tetrahedral (or triangular pyramidal) numbers: a(n) = C(n+2,3) = n*(n+1)*(n+2)/6. A292

a(n) = 1² + 3² + 5² + 7² + ... + (2·n-1)² = n*(4·n² - 1)/3. A447

Number of sets of nonempty subsets of {1..n} satisfying a strict version of the axiom of choice. A367902

a(n) = 2·n² - n + 1. A130883

Expansion of 1/((1-x)²*∏_k>=1 (1-x^k)). A14153

Triangle of B-analogs of Stirling numbers of the second kind. A39755

Expansion of (1+x)/(1-x²)⁴: duplicated tetrahedral numbers. A58187