Properties of the Number -231

Two Hundred Thirty-One

Basics

Value: -232 → -231 → -230

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 6

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 11

Divisors: 1, 3, 7, 11, 21, 33, 77, 231

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11100111

Octal: -347

Duodecimal: -173

Hexadecimal: -e7

Square: 53361

Square Root: 15.198684153570664

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/(1 - x + 4·x²). A106853

Triangle of Lehmer-Comtet numbers of the first kind. A8296

Numerator of coefficients of Euler polynomials (rising powers). A60096

Alternating sum of squares to n. A89594

Dirichlet inverse of A003961, where A003961(n) is fully multiplicative with a(prime(k)) = prime(k+1). A346234

Expansion of (1-x-x^N)/((1-x)(1-x²)(1-x³)...(1-x^N)) for N = 5. A60024

G.f. A(x) satisfies A(x) = (1 + x / sqrt(A(x))) / (1 - x). A366403

Square array A(n, k) = A246278(1+n, k) - 2·A246278(n, k), read by falling antidiagonals, where A246278 is the prime shift array. A372562

Determinant of the n X n matrix whose element (i,j) equals the (i-j)-th composite number, (j-i)-th prime number, or 1 if i=j. A71082

Triangle of generalized Stirling numbers of the first kind read by rows: T(n, k) = (-1)^n+k*∑_m=0..n Stirling1(n, m) * binomial(m, k) * 2^m-k, where Stirling1 is A048994. A94646