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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
  • 181 is the smallest palindromic prime with digit sum 10
  • 181 is the smallest number n such that the binary complement of n is greater than the binary complement of n2
  • 181 is the smallest number that have more zeros in its binary representation compared to its square

Rare Properties of 181

Palindromic prime

Common Properties of 181

Deficient
Odd
Odious
Palindrome
Prime
Square-free
Twin
Undulating