Properties of the Number 51990

Fifty-One Thousand Nine Hundred Ninety

Basics

Value: 51989 → 51990 → 51991

Parity: even

Prime: No

Previous Prime: 51977

Next Prime: 51991

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 5 × 1733

Divisors: 1, 2, 3, 5, 6, 10, 15, 30, 1733, 3466

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100101100010110

Octal: 145426

Duodecimal: 26106

Hexadecimal: cb16

Square: 2702960100

Square Root: 228.01315751508727

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) = ∑_i=1..n binomial(i+5,6)². A86027

Number triangle of sums of squared binomial coefficients. A110197

a(n) = 36·n² + 6. A158479

Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 76. A31754

Numbers m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,23. A64248

Expansion of g.f.: 1/(1 - x - 2·x² + x³ + x⁴ + 2·x⁷ - 5·x⁹ + 2·x¹¹ + x¹⁴ + x¹⁵ - 2·x¹⁶ - x¹⁷ + x¹⁸). A147622

Discriminants of real quadratic fields of ERD-type with class groups of exponent 2 and discriminants of the form D = r²*k²+k, k odd. A51990