Properties of the Number 67921

Sixty-Seven Thousand Nine Hundred Twenty-One

Basics

Value: 67920 → 67921 → 67922

Parity: odd

Prime: No

Previous Prime: 67901

Next Prime: 67927

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 7 × 31 × 313

Divisors: 1, 7, 31, 217, 313, 2191, 9703, 67921

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10000100101010001

Octal: 204521

Duodecimal: 33381

Hexadecimal: 10951

Square: 4613262241

Square Root: 260.61657660248704

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

Euler pseudoprimes to base 5: composite integers such that abs(5^{(n - 1}/2)) == 1 mod n. A262052

Base-5 Euler-Jacobi pseudoprimes: odd composite k coprime to 5 such that 5^(k-1/2) == (5/k) (mod n), where (5/k) is the Jacobi symbol (or Kronecker symbol). A375914

Composite numbers k == 1, 9 (mod 10) such that 5^(k-1/2) == 1 (mod k). A375915

G.f.: (x+4·x³+x⁵)/((1-x)²*(1-x²)²*(1-x³)). A83707

Number of planar vertically indecomposable distributive lattices with n nodes. A345734

Expansion of 1/((1-5x)(1-9x)(1-10x)). A20494

Start with 1 and repeatedly reverse the digits and add 65 to get the next term. A118163

Engel expansion of sqrt(π/2). A67921