12031155 has 24 divisors (see below), whose sum is σ = 22082112. Its totient is φ = 6038784.

The previous prime is 12031153. The next prime is 12031169. The reversal of 12031155 is 55113021.

It is not a de Polignac number, because 12031155 - 2¹ = 12031153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12031153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7099 + ... + 8628.

It is an arithmetic number, because the mean of its divisors is an integer number (920088).

Almost surely, 2^12031155 is an apocalyptic number.

12031155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12031155 is a deficient number, since it is larger than the sum of its proper divisors (10050957).

12031155 is a wasteful number, since it uses less digits than its factorization.

12031155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15755 (or 15752 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 12031155 is about 3468.5955371014. The cubic root of 12031155 is about 229.1408082485.

Adding to 12031155 its reverse (55113021), we get a palindrome (67144176).

The spelling of 12031155 in words is "twelve million, thirty-one thousand, one hundred fifty-five".