12131113109 has 2 divisors, whose sum is σ = 12131113110. Its totient is φ = 12131113108.

The previous prime is 12131113067. The next prime is 12131113121. The reversal of 12131113109 is 90131113121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6205500625 + 5925612484 = 78775^2 + 76978^2 .

It is a cyclic number.

It is not a de Polignac number, because 12131113109 - 2²⁰ = 12130064533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12131113139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065556554 + 6065556555.

It is an arithmetic number, because the mean of its divisors is an integer number (6065556555).

Almost surely, 2^12131113109 is an apocalyptic number.

It is an amenable number.

12131113109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131113109 is an equidigital number, since it uses as much as digits as its factorization.

12131113109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 12131113109 in words is "twelve billion, one hundred thirty-one million, one hundred thirteen thousand, one hundred nine".