1213543252217 has 2 divisors, whose sum is σ = 1213543252218. Its totient is φ = 1213543252216.

The previous prime is 1213543252121. The next prime is 1213543252261. The reversal of 1213543252217 is 7122523453121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1195652584681 + 17890667536 = 1093459^2 + 133756^2 .

It is an emirp because it is prime and its reverse (7122523453121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213543252217 - 2²⁰ = 1213542203641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213543252717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606771626108 + 606771626109.

It is an arithmetic number, because the mean of its divisors is an integer number (606771626109).

Almost surely, 2^{1213543252217} is an apocalyptic number.

It is an amenable number.

1213543252217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213543252217 is an equidigital number, since it uses as much as digits as its factorization.

1213543252217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 38.

The spelling of 1213543252217 in words is "one trillion, two hundred thirteen billion, five hundred forty-three million, two hundred fifty-two thousand, two hundred seventeen".