Properties of the Number -49

Forty-Nine

Basics

Value: -50 → -49 → -48

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 7 ²

Divisors: 1, 7, 49

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110001

Octal: -61

Duodecimal: -41

Hexadecimal: -31

Square: 2401

Square Root: 7

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 q^1/24 * η(q) / η(q²) in powers of q. A81362

a(n) = 2 - n. A22958

Product of A049310 and A007318 as lower triangular matrices. A101950

a(n) = n*(-1)ⁿ. A38608

Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of ∏_j>=1 (1 - x^j)^k. A286354

Alternating sum σ(1)-σ(2)+σ(3)-σ(4)+...+((-1)ⁿ⁺¹)*σ(n). A68762

a(n) = (-n³ + 9n² - 5n + 3)/3. A161702

The integers (shown from -50 on). A256958

a(n) = -n. A1489

Generalized Stirling number triangle of first kind read by rows: T(n, k) = [x^k] ∏_m=1..n (x - m - r), with r = 3. A49459