Properties of the Number 19971

Nineteen Thousand Nine Hundred Seventy-One

Basics

Value: 19970 → 19971 → 19972

Parity: odd

Prime: No

Previous Prime: 19963

Next Prime: 19973

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 7 × 317

Divisors: 1, 3, 7, 9, 21, 63, 317, 951, 2219, 2853

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111000000011

Octal: 47003

Duodecimal: B683

Hexadecimal: 4e03

Square: 398840841

Square Root: 141.31878855976655

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

Coefficients of the power series expansion at p=1 of the growth rate C(p) of the length of the longest increasing path in an Erdös-Rényi graph with edge probability p. A321309

Unicode codes for the Han digits. A61745

Number of (w,x,y,z) with all terms in {1,...,n} and 3w=x+y+z+n+2. A212252

Positions of 0's in A330314. A330325

a(n) = n*(6·n² + 15·n + 5)/2. A163833

Number of 3 X n 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4. A240002

Expansion of 1/((1-3x)(1-4x)(1-5x)(1-7x)). A28026

Numbers k such that 271·2^k-1 is prime. A50894

Decimal expansion of tangent of 73 degrees. A19971

Number of length-n 0..7 arrays with no repeated value differing from the previous repeated value by one or less. A269605