12031189 has 4 divisors (see below), whose sum is σ = 12738924. Its totient is φ = 11323456.

The previous prime is 12031169. The next prime is 12031211. The reversal of 12031189 is 98113021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98113021 = 647 ⋅151643.

It can be written as a sum of positive squares in 2 ways, for example, as 8898289 + 3132900 = 2983^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 12031189 - 2⁹ = 12030677 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 (12031169) 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, 353842 + ... + 353875.

It is an arithmetic number, because the mean of its divisors is an integer number (3184731).

Almost surely, 2^12031189 is an apocalyptic number.

It is an amenable number.

12031189 is a deficient number, since it is larger than the sum of its proper divisors (707735).

12031189 is an equidigital number, since it uses as much as digits as its factorization.

12031189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707734.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 12031189 is about 3468.6004382171. The cubic root of 12031189 is about 229.1410240987.

The spelling of 12031189 in words is "twelve million, thirty-one thousand, one hundred eighty-nine".