12128112631 has 2 divisors, whose sum is σ = 12128112632. Its totient is φ = 12128112630.

The previous prime is 12128112569. The next prime is 12128112641. The reversal of 12128112631 is 13621182121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12128112631 is a prime.

It is a super-2 number, since 2×12128112631² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12128112631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12128112641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6064056315 + 6064056316.

It is an arithmetic number, because the mean of its divisors is an integer number (6064056316).

Almost surely, 2^12128112631 is an apocalyptic number.

12128112631 is a deficient number, since it is larger than the sum of its proper divisors (1).

12128112631 is an equidigital number, since it uses as much as digits as its factorization.

12128112631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 28.

Adding to 12128112631 its reverse (13621182121), we get a palindrome (25749294752).

The spelling of 12128112631 in words is "twelve billion, one hundred twenty-eight million, one hundred twelve thousand, six hundred thirty-one".