12188131 has 4 divisors (see below), whose sum is σ = 12199264. Its totient is φ = 12177000.

The previous prime is 12188123. The next prime is 12188159. The reversal of 12188131 is 13188121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12188131 - 2³ = 12188123 is a prime.

It is a super-2 number, since 2×12188131² = 297101074546322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12188096 and 12188105.

It is not an unprimeable number, because it can be changed into a prime (12188191) 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, 3720 + ... + 6181.

It is an arithmetic number, because the mean of its divisors is an integer number (3049816).

Almost surely, 2^12188131 is an apocalyptic number.

12188131 is a deficient number, since it is larger than the sum of its proper divisors (11133).

12188131 is an equidigital number, since it uses as much as digits as its factorization.

12188131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11132.

The product of its digits is 384, while the sum is 25.

The square root of 12188131 is about 3491.1503834696. The cubic root of 12188131 is about 230.1330735899.

The spelling of 12188131 in words is "twelve million, one hundred eighty-eight thousand, one hundred thirty-one".