Properties of the Number -7721

Seven Hundred Twenty-One

Basics

Value: -7722 → -7721 → -7720

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 7 × 1103

Divisors: 1, 7, 1103, 7721

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1111000101001

Octal: -17051

Duodecimal: -4575

Hexadecimal: -1e29

Square: 59613841

Square Root: 87.86922100485471

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

Coefficients in the power series expansion of A(x) = ∑_n=-oo..+oo n*(n+1)*(n+2)/6·x^3·n * (1 - xⁿ)^n-2. A357156

Numerator of Bernoulli(n, -2/3). A157811

Number of partitions of n-1 boys and one girl with no couple. A120452

Number of atoms in a decahedron with n shells. A4068

Number of nonempty pairwise coprime subsets of {1,...,n}, where a single number is not considered to be pairwise coprime unless it is equal to 1. A320426

Numbers n such that p(8n) is prime, where p(n) is the number of partitions of n. A114168

a(n) is the least exponent e such that 3^e has exactly n consecutive 3's in its decimal representation. A131550

Number of (w,x,y,z) with all terms in {1,...,n} and |w-x|=|x-y|+|y-z|. A212570

Numbers k not ending in 0 such that for some base b, k_b is the reverse of k₁₀ (where k_b denotes k written in base b). A34294

Number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 203", based on the 5-celled von Neumann neighborhood. A270725