12643131 has 4 divisors (see below), whose sum is σ = 16857512. Its totient is φ = 8428752.

The previous prime is 12643117. The next prime is 12643177. The reversal of 12643131 is 13134621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13134621 = 3 ⋅4378207.

It is not a de Polignac number, because 12643131 - 2⁷ = 12643003 is a prime.

It is a super-2 number, since 2×12643131² = 319697522966322, 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 = 12643098 and 12643107.

It is not an unprimeable number, because it can be changed into a prime (12642131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2107186 + ... + 2107191.

It is an arithmetic number, because the mean of its divisors is an integer number (4214378).

Almost surely, 2^12643131 is an apocalyptic number.

12643131 is a deficient number, since it is larger than the sum of its proper divisors (4214381).

12643131 is an equidigital number, since it uses as much as digits as its factorization.

12643131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4214380.

The product of its digits is 432, while the sum is 21.

The square root of 12643131 is about 3555.7180709387. The cubic root of 12643131 is about 232.9618890555.

Adding to 12643131 its reverse (13134621), we get a palindrome (25777752).

The spelling of 12643131 in words is "twelve million, six hundred forty-three thousand, one hundred thirty-one".