12131426 has 4 divisors (see below), whose sum is σ = 18197142. Its totient is φ = 6065712.

The previous prime is 12131417. The next prime is 12131429. The reversal of 12131426 is 62413121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62413121 = 367 ⋅170063.

It can be written as a sum of positive squares in only one way, i.e., 11323225 + 808201 = 3365^2 + 899^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12131398 and 12131407.

It is not an unprimeable number, because it can be changed into a prime (12131429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3032855 + ... + 3032858.

Almost surely, 2^12131426 is an apocalyptic number.

12131426 is a deficient number, since it is larger than the sum of its proper divisors (6065716).

12131426 is an equidigital number, since it uses as much as digits as its factorization.

12131426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6065715.

The product of its digits is 288, while the sum is 20.

The square root of 12131426 is about 3483.0196668983. The cubic root of 12131426 is about 229.7756223883.

Adding to 12131426 its reverse (62413121), we get a palindrome (74544547).

The spelling of 12131426 in words is "twelve million, one hundred thirty-one thousand, four hundred twenty-six".