1213311217 has 2 divisors, whose sum is σ = 1213311218. Its totient is φ = 1213311216.

The previous prime is 1213311191. The next prime is 1213311227. The reversal of 1213311217 is 7121133121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 833996641 + 379314576 = 28879^2 + 19476^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213311217 - 2²⁷ = 1079093489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213311227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606655608 + 606655609.

It is an arithmetic number, because the mean of its divisors is an integer number (606655609).

Almost surely, 2^1213311217 is an apocalyptic number.

It is an amenable number.

1213311217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213311217 is an equidigital number, since it uses as much as digits as its factorization.

1213311217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 22.

The square root of 1213311217 is about 34832.6171425576. The cubic root of 1213311217 is about 1066.5733735572.

Adding to 1213311217 its reverse (7121133121), we get a palindrome (8334444338).

The spelling of 1213311217 in words is "one billion, two hundred thirteen million, three hundred eleven thousand, two hundred seventeen".