1312126217 has 2 divisors, whose sum is σ = 1312126218. Its totient is φ = 1312126216.

The previous prime is 1312126177. The next prime is 1312126229. The reversal of 1312126217 is 7126212131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1305449161 + 6677056 = 36131^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312126217 - 2¹⁰ = 1312125193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312126117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656063108 + 656063109.

It is an arithmetic number, because the mean of its divisors is an integer number (656063109).

Almost surely, 2^1312126217 is an apocalyptic number.

It is an amenable number.

1312126217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312126217 is an equidigital number, since it uses as much as digits as its factorization.

1312126217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 1312126217 is about 36223.2828026395. The cubic root of 1312126217 is about 1094.7758392434.

Adding to 1312126217 its reverse (7126212131), we get a palindrome (8438338348).

The spelling of 1312126217 in words is "one billion, three hundred twelve million, one hundred twenty-six thousand, two hundred seventeen".