Properties of the Number 31530

Thirty-One Thousand Five Hundred Thirty

Basics

Value: 31529 → 31530 → 31531

Parity: even

Prime: No

Previous Prime: 31517

Next Prime: 31531

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 × 1051

Divisors: 1, 2, 3, 5, 6, 10, 15, 30, 1051, 2102

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111101100101010

Octal: 75452

Duodecimal: 162B6

Hexadecimal: 7b2a

Square: 994140900

Square Root: 177.56688880531752

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

Number of numbers k in interval [(p_n)²+1, (p_n)⁴] for which lpf(k-3)>lpf(k-1)>=p_n, where p_n=prime(n) and lpf = A020639. A243803

Triangle of coefficients of polynomials u(n,x) jointly generated with A210861; see the Formula section of A210861. A210860

Numbers k such that k² +/- (k-1) and (k-1)*k² +/- 1 are all primes. A239326

Take apart the sides of each of the integer-sided scalene triangles with perimeter n (at their vertices) and rearrange them orthogonally in 3-space so that their endpoints coincide at a single point. a(n) is the total surface area of all rectangular prisms enclosed in this way. A308235

Least k such that k*(Mersenne_prime(n)²) + 1 is prime. A98819

Integers n such that the digit set of n² is {0,1,4,9}. A317579

Number of achiral colorings of the 12 pentagonal faces of a regular dodecahedron or the 12 vertices of a regular icosahedron using n or fewer colors. A337962

Number of nX2 0..3 arrays with no element less than a strict majority of its horizontal, vertical and antidiagonal neighbors. A231694

Number of 5Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s. A297598

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 32. A31530