Properties of the Number 19901

Nineteen Thousand Nine Hundred One

Basics

Value: 19900 → 19901 → 19902

Parity: odd

Prime: No

Previous Prime: 19891

Next Prime: 19913

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 7 × 2843

Divisors: 1, 7, 2843, 19901

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110110111101

Octal: 46675

Duodecimal: B625

Hexadecimal: 4dbd

Square: 396049801

Square Root: 141.0709041581573

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

Triangle of coefficients of certain polynomials used with prime numbers as variables in the computation of the array A103728. A103718

Trajectory of n under the Reverse and Add! operation carried out in base 3 (presumably) does not reach a palindrome and (presumably) does not join the trajectory of any term m < n. A77405

Third row of Pascal-(1,4,1) array A081579. A81587

Numbers k such that (2·k)!/(2*(k!)²)+1 is prime. A112863

Denominators of continued fraction convergents to fifth root of 5. A2363

Large-q series expansion for the exponential of the surface free energy of the square-lattice zero-temperature Potts antiferromagnet, in terms of the variable z = 1/(q - 1). A238835

a(n) = (L(n) + L(2·n))/2, where L = A000032 (the Lucas sequence). A49680

Column m=2 sequence of triangle A103718(n,m), n >= 0 (without leading zeros). A103719

Numbers k such that k = T(x) + T(y) where T(m) is the m-th triangular number and k is concatenate(x, y) in base 10. A113796

Number of 1-sided polykites with n cells. A151528