Properties of the Number -31880

Thirty-One Thousand Eight Hundred Eighty

Basics

Value: -31881 → -31880 → -31879

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ³ × 5 × 797

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 797, 1594

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: -111110010001000

Octal: -76210

Duodecimal: -16548

Hexadecimal: -7c88

Square: 1016334400

Square Root: 178.54971296532514

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

T(n,k)=Number of length-n 0..k arrays with no following elements larger than the first repeated value. A267471

a(n) is the number of different degrees in the sequence of the degrees of the irreducible representations of the symmetric group S_n, i.e., count each degree only once. A60437

a(n) is the number of terms in the expansion of (x+y-z)*(x²+y²-z²)*(x³+y³-z³)*...*(xⁿ+yⁿ-zⁿ). A86817

Expansion of (1/(1-x+x²))c(x/(1-x+x²)), c(x) the g.f. of A000108. A174107

Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column plus the two sums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A259003

Number of length-n 0..5 arrays with no following elements larger than the first repeated value. A267468

Number of length-6 0..n arrays with no following elements larger than the first repeated value. A267474

Numbers k such that Bernoulli number B_k has denominator 13530. A295587

Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of 1/(1 - ∑_j>=1 j^k*x^j). A320251

Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 89. A31587