12031291 has 4 divisors (see below), whose sum is σ = 12739032. Its totient is φ = 11323552.

The previous prime is 12031289. The next prime is 12031297. The reversal of 12031291 is 19213021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12031291 - 2¹ = 12031289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12031297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353845 + ... + 353878.

It is an arithmetic number, because the mean of its divisors is an integer number (3184758).

Almost surely, 2^12031291 is an apocalyptic number.

12031291 is a deficient number, since it is larger than the sum of its proper divisors (707741).

12031291 is an equidigital number, since it uses as much as digits as its factorization.

12031291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707740.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 12031291 is about 3468.6151415226. The cubic root of 12031291 is about 229.1416716467.

The spelling of 12031291 in words is "twelve million, thirty-one thousand, two hundred ninety-one".