12131240257 has 2 divisors, whose sum is σ = 12131240258. Its totient is φ = 12131240256.

The previous prime is 12131240227. The next prime is 12131240291. The reversal of 12131240257 is 75204213121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9002404161 + 3128836096 = 94881^2 + 55936^2 .

It is a cyclic number.

It is not a de Polignac number, because 12131240257 - 2¹¹ = 12131238209 is a prime.

It is not a weakly prime, because it can be changed into another prime (12131240227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065620128 + 6065620129.

It is an arithmetic number, because the mean of its divisors is an integer number (6065620129).

Almost surely, 2^12131240257 is an apocalyptic number.

It is an amenable number.

12131240257 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131240257 is an equidigital number, since it uses as much as digits as its factorization.

12131240257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 12131240257 its reverse (75204213121), we get a palindrome (87335453378).

The spelling of 12131240257 in words is "twelve billion, one hundred thirty-one million, two hundred forty thousand, two hundred fifty-seven".