12155 has 16 divisors (see below), whose sum is σ = 18144.
Its totient is φ = 7680.
The previous prime is 12149. The next prime is 12157. The reversal of 12155 is 55121.
Adding to 12155 its reverse (55121), we get a palindrome (67276).
12155 = T29 + T30 + ... +
12155 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is not a de Polignac number, because 12155 - 210 = 11131 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12157) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 707 + ... + 723.
It is an arithmetic number, because the mean of its divisors is an integer number (1134).
212155 is an apocalyptic number.
12155 is a deficient number, since it is larger than the sum of its proper divisors (5989).
12155 is a wasteful number, since it uses less digits than its factorization.
12155 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 46.
The product of its digits is 50, while the sum is 14.
The square root of 12155 is about 110.2497165529.
The cubic root of 12155 is about 22.9924360761.
The spelling of 12155 in words is "twelve thousand, one hundred fifty-five".