12131986 has 4 divisors (see below), whose sum is σ = 18197982. Its totient is φ = 6065992.

The previous prime is 12131963. The next prime is 12132011. The reversal of 12131986 is 68913121.

12131986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 10989225 + 1142761 = 3315^2 + 1069^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3032995 + ... + 3032998.

Almost surely, 2^12131986 is an apocalyptic number.

12131986 is a deficient number, since it is larger than the sum of its proper divisors (6065996).

12131986 is an equidigital number, since it uses as much as digits as its factorization.

12131986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6065995.

The product of its digits is 2592, while the sum is 31.

The square root of 12131986 is about 3483.1000559846. The cubic root of 12131986 is about 229.7791578993.

The spelling of 12131986 in words is "twelve million, one hundred thirty-one thousand, nine hundred eighty-six".