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Unique Properties of 181

  • 181 is the start of the first occurrence of two successive primes using no prime digits (181, 191)
  • 181 starts the first occurrence of two consecutive primes which are both multidigit palindromes: 181, 191

Rare Properties of 181

Palindromic prime

Common Properties of 181

Deficient
Odd
Odious
Palindrome
Prime
Square-free
Twin
Undulating