Properties of the Number -1949

Nine Hundred Forty-Nine

Basics

Value: -1950 → -1949 → -1948

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 1949

Divisors: 1, 1949

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -11110011101

Octal: -3635

Duodecimal: -1165

Hexadecimal: -79d

Square: 3798601

Square Root: 44.14748010928823

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

G.f. A(x) satisfies: A(x)² = A(x²) + 4·x. A107087

G.f. A(x) satisfies: A(x) = A(x²)^1/2 + 4·x. A107088

Partition function coefficients for square lattice spin 1 Ising model. A10107

Triangle read by rows giving the coefficients of general sum formulas of n-th Subfactorial numbers (A000166). The k-th row (k>=1) contains T(i,k) for i=1 to 2·k-1, where T(i,k) satisfies Subf(n) = ∑_k=1..n ∑_i=1..2·k-1 T(i,k) * C(n-k,i-1) * n^n-k. A101560

a(1) = 1; a(2) = 1; a(3) = 1; a(4) = 1; a(5) = 1; a(n) = a(n-1)+4a(n-2)-3a(n-3)-3a(n-4)+a(n-5) for n >= 6. A122608

G.f. A(x) satisfies 0 = f(A(x), A(x²)) where f(u, v) = u * (u - 2) - (v + 2). A193527

Primes of the form 2x² + 2xy + 17y². A139827

Number of integer partitions of n that can be partitioned into two or more blocks with equal sums. A321452

Smallest prime > n². A7491

The slowest increasing sequence of primes such that difference of successive terms is unique. A84758