Properties of the Number -171990

One Hundred Seventy-One Thousand Nine Hundred Ninety

Basics

Value: -171991 → -171990 → -171989

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ³ × 5 × 7 ² × 13

Divisors: 1, 2, 3, 5, 6, 7, 9, 10, 13, 14

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001111111010110

Octal: -517726

Duodecimal: -83646

Hexadecimal: -29fd6

Square: 29580560100

Square Root: 414.7167708207615

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

Consider the base-4 Kaprekar map n->K(n) defined in A165012. Sequence gives numbers belonging to cycles, including fixed points. A165017

List of fixed points of the base-4 Kaprekar map A165012. A165016

Smallest member of cycle corresponding to n-th term of A165029. A165030

Consider the base-4 Kaprekar map n->K(n) defined in A165012. Sequence gives least elements of each cycle, including fixed points. A165021

Triangle read by rows, 3^k*S₃(n, k) where S_m(n, k) are the Stirling-Frobenius subset numbers of order m; n >= 0, k >= 0. A225466

a(n) = ∏_d∣n A019565(d)^A010051(n/d). A329352

Triangle read by rows: (1/5) * (A007318⁴ - A007318^-1) as infinite lower triangular matrices. A131050

26-gonal pyramidal numbers: a(n) = n*(n+1)*(8·n-7)/2. A256646

a(n) = numerator(b(n)), where b(0) = b(1) = 1 and b(n) = n·b(n-1)/b(n-2) for n >= 1. A329654

Numbers n > 0 such that n⁶ + 1091 and n⁶ + 1093 are both prime. A181114