12131340157 has 2 divisors, whose sum is σ = 12131340158. Its totient is φ = 12131340156.

The previous prime is 12131340121. The next prime is 12131340217. The reversal of 12131340157 is 75104313121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7247287161 + 4884052996 = 85131^2 + 69886^2 .

It is a cyclic number.

It is not a de Polignac number, because 12131340157 - 2²⁷ = 11997122429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12131340757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065670078 + 6065670079.

It is an arithmetic number, because the mean of its divisors is an integer number (6065670079).

Almost surely, 2^12131340157 is an apocalyptic number.

It is an amenable number.

12131340157 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131340157 is an equidigital number, since it uses as much as digits as its factorization.

12131340157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

Adding to 12131340157 its reverse (75104313121), we get a palindrome (87235653278).

The spelling of 12131340157 in words is "twelve billion, one hundred thirty-one million, three hundred forty thousand, one hundred fifty-seven".