12131541217 has 2 divisors, whose sum is σ = 12131541218. Its totient is φ = 12131541216.

The previous prime is 12131541197. The next prime is 12131541229. The reversal of 12131541217 is 71214513121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6866442496 + 5265098721 = 82864^2 + 72561^2 .

It is a cyclic number.

It is not a de Polignac number, because 12131541217 - 2⁷ = 12131541089 is a prime.

It is not a weakly prime, because it can be changed into another prime (12131541277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065770608 + 6065770609.

It is an arithmetic number, because the mean of its divisors is an integer number (6065770609).

Almost surely, 2^12131541217 is an apocalyptic number.

It is an amenable number.

12131541217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131541217 is an equidigital number, since it uses as much as digits as its factorization.

12131541217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 28.

The spelling of 12131541217 in words is "twelve billion, one hundred thirty-one million, five hundred forty-one thousand, two hundred seventeen".