Properties of the Number 51987

Fifty-One Thousand Nine Hundred Eighty-Seven

Basics

Value: 51986 → 51987 → 51988

Parity: odd

Prime: No

Previous Prime: 51977

Next Prime: 51991

Digit Sum: 30

Digital Root: 3

Palindrome: No

Factorization: 3 × 13 × 31 × 43

Divisors: 1, 3, 13, 31, 39, 43, 93, 129, 403, 559

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1100101100010011

Octal: 145423

Duodecimal: 26103

Hexadecimal: cb13

Square: 2702648169

Square Root: 228.0065788524533

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

Place n points in general position on each side of an equilateral triangle, and join every pair of the 3·n+3 boundary points by a chord; sequence gives number of vertices in the resulting planar graph. A367117

Number of black-and-white colored (or proper magnetic) space groups in dimension n, not counting enantiomorphs. A307292

Table read by antidiagonals: Place k points in general position on each side of a regular n-gon and join every pair of the n*(k+1) boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives number of vertices in the resulting planar graph. A367183

Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 22. A51987