Properties of the Number 31668

Thirty-One Thousand Six Hundred Sixty-Eight

Basics

Value: 31667 → 31668 → 31669

Parity: even

Prime: No

Previous Prime: 31667

Next Prime: 31687

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 7 × 13 × 29

Divisors: 1, 2, 3, 4, 6, 7, 12, 13, 14, 21

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101110110100

Octal: 75664

Duodecimal: 163B0

Hexadecimal: 7bb4

Square: 1002862224

Square Root: 177.95505050433383

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

Numbers k such that k² divides 5^k-1. A127105

MacMahon's generalized sum of divisors function. A2128

Expansion of (1-x)/(1+x+2·x²). A78050

Distinct even elements in the 5-Pascal triangle A028313. A28320

Even elements to the right of the central elements of the 5-Pascal triangle A028313. A28321

Numbers k such that 5^k mod k = 5^k mod k². A125775

Sums of the products of n consecutive pairs of numbers. A135036

Numbers k such that ψ(k²) = k, ψ = A002322; indices of 1 in A341857. A341858

a(n) = (n-1)*n*(n+1)*(n+2)*(2·n+1)/40. A112851

a(n) = 2·n*(9·n-1). A178574