- 161 is the sum of five consecutive prime numbers: 23, 29, 31, 37, and 41
- 161 is a hexagonal pyramidal number.
- 161 is a semiprime. Since its prime factors 7 and 23 are both Gaussian primes, 161 is a Blum integer.
- 161 is a palindromic number
- 161 / 72 is a commonly used rational approximation of the square root of 5 and is the closest fraction with denominator <300 to that number.
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Didn't a Cat help you see the beauty of the nbers?
My cats help me see beauty and hope everywhere!
My cat makes me clean up and rearrange the furniture to his liking. He has a Baroque style.