Properties of the Number 31556

Thirty-One Thousand Five Hundred Fifty-Six

Basics

Value: 31555 → 31556 → 31557

Parity: even

Prime: No

Previous Prime: 31547

Next Prime: 31567

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 7 ³ × 23

Divisors: 1, 2, 4, 7, 14, 23, 28, 46, 49, 92

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111101101000100

Octal: 75504

Duodecimal: 16318

Hexadecimal: 7b44

Square: 995781136

Square Root: 177.6400855662933

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

a(n) is the smallest number > 1 such that the concatenation a(1)a(2)...a(n) is a perfect power. A264733

Number of prime alternating tangles (or knots) of type Gamma₂ with two connected components. A67645

Number of partitions of n with difference 3 between the number of odd parts and the number of even parts, both counted without multiplicity. A242694

Number of ordered unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 2. A244531

G.f.: A(x) = INV(x - x·INV(x - 2·x²*INV(x - 3·x³*INV(x - 4·x⁴*INV(x - ...))))), where INV(F(x)) = series reversion of F(x). A196709

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 58. A31556