Properties of the Number 31487

Thirty-One Thousand Four Hundred Eighty-Seven

Basics

Value: 31486 → 31487 → 31488

Parity: odd

Prime: No

Previous Prime: 31481

Next Prime: 31489

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 23 × 37 ²

Divisors: 1, 23, 37, 851, 1369, 31487

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101011111111

Octal: 75377

Duodecimal: 1627B

Hexadecimal: 7aff

Square: 991431169

Square Root: 177.44576636257062

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 nXk 0..2 arrays with no more than floor(nXk/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order. A222649

a(n) = 23·n². A244632

a(n) = dot_product(1,2,...,n)*(3,4,...,n,1,2). A26037

a(n) = 8 + floor((2 + ∑_j=1..n-1 a(j))/4). A120166

Numbers k such that k!! - 2^k is prime. A124249

Odd numbers k such that A173557(k) = A173557(σ(k)), where A173557(n) is multiplicative with a(p^e) = p-1 and σ is the sum of divisors function. A387159

Numbers whose set of base-13 digits is {1,4}. A32825

Numbers k such that sopf(k) = sopfr(k+1), where sopf(k) = A008472(k) and sopfr(k) = A001414(k). A64678

Number of nX4 0..2 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order. A222645

Number of nX6 0..2 arrays with no more than floor(nX6/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order. A222647