• 29 can be written using four 4's:
• If 2 + 7 and (+1)2 + 7 are both divisible by a number > 1, then = 29. (For example, this happens for = 14.)
• Sorting the digits of 229 in ascending order we obtain a prime (12356789).
• Deleting all the even digits from 229 = 536870912 we obtain a prime (53791).
29 is nontrivially palindromic in base 4.
29 is an esthetic number in base 6, base 9, base 13 and base 14, because in such bases its adjacent digits differ by 1.
It is a strong prime.
29 is a truncatable prime.
It is a cyclic number.
It is a Sophie Germain prime.
It is a Chen prime.
29 is a Gilda number.
It is a tetranacci number.
It is a Lucas number.
It is a magnanimous number.
It is an alternating number because its digits alternate between even and odd.
29 is an undulating number in base 4.
It is the 12-th Perrin number.
It is a Curzon number.
It is a plaindrome in base 6, base 8, base 10, base 11, base 12, base 13, base 15 and base 16.
It is a nialpdrome in base 7, base 9 and base 14.
It is a congruent number.
It is a good prime.
It is an amenable number.
29 is an equidigital number, since it uses as much as digits as its factorization.
29 is an evil number, because the sum of its binary digits is even.
The square root of 29 is about 5.3851648071. The cubic root of 29 is about 3.0723168257.
Subtracting from 29 its product of digits (18), we obtain a palindrome (11).
Adding to 29 its reverse (92), we get a palindrome (121).