Properties of the Number 51998

Fifty-One Thousand Nine Hundred Ninety-Eight

Basics

Value: 51997 → 51998 → 51999

Parity: even

Prime: No

Previous Prime: 51991

Next Prime: 52009

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 2 × 25999

Divisors: 1, 2, 25999, 51998

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100101100011110

Octal: 145436

Duodecimal: 26112

Hexadecimal: cb1e

Square: 2703792004

Square Root: 228.030699687564

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 n X k nonnegative integer arrays with each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it) and the lower right element equal to min(n,k)-1. A202735

G.f. A(x) satisfies: A( x²*A(x) - A(x)⁴ ) = x³. A292928

Semiprimes (A001358) whose digit reversal is a pentagonal number (A000326). A115708

Row sums of triangle A179901. A179902

Number of n X 3 nonnegative integer arrays each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it) and the lower right element equal to min(n,3)-1. A202730

Number of separable partitions of n in which the number of distinct (repeatable) parts is > 4. A325719

Consider real quadratic fields of ERD-type with class groups of exponent 2 and discriminants of the form D = r²*k²+4k, k odd; sequence gives values of k. A51998