Properties of the Number 171

One Hundred Seventy-One

Basics

Value: 170 → 171 → 172

Parity: odd

Prime: No

Previous Prime: 167

Next Prime: 173

Digit Sum: 9

Digital Root: 9

Palindrome: Yes

Factorization: 3 ² × 19

Divisors: 1, 3, 9, 19, 57, 171

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101011

Octal: 253

Duodecimal: 123

Hexadecimal: ab

Square: 29241

Square Root: 13.076696830622021

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

Triangular numbers: a(n) = binomial(n+1,2) = n*(n+1)/2 = 0 + 1 + 2 + ... + n. A217

Palindromes in base 10. A2113

Jacobsthal sequence (or Jacobsthal numbers): a(n) = a(n-1) + 2·a(n-2), with a(0) = 0, a(1) = 1; also a(n) = nearest integer to 2ⁿ/3. A1045

Toothpick sequence (see Comments lines for definition). A139250

Niven (or Harshad, or harshad) numbers: numbers that are divisible by the sum of their digits. A5349

a(n) = 3·n. A8585

Lucky numbers. A959

Numbers that are the product of exactly three (not necessarily distinct) primes. A14612

Positive integers which are neither squarefree integers nor prime powers. A126706

a(n) = 4·n + 3. A4767

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