12031311 has 8 divisors (see below), whose sum is σ = 16189360. Its totient is φ = 7947072.

The previous prime is 12031307. The next prime is 12031319. The reversal of 12031311 is 11313021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12031311 - 2² = 12031307 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 (12031319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18070 + ... + 18723.

It is an arithmetic number, because the mean of its divisors is an integer number (2023670).

Almost surely, 2^12031311 is an apocalyptic number.

12031311 is a deficient number, since it is larger than the sum of its proper divisors (4158049).

12031311 is a wasteful number, since it uses less digits than its factorization.

12031311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36905.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 12031311 is about 3468.6180245164. The cubic root of 12031311 is about 229.1417986165.

Adding to 12031311 its reverse (11313021), we get a palindrome (23344332).

The spelling of 12031311 in words is "twelve million, thirty-one thousand, three hundred eleven".