1212313217 has 2 divisors, whose sum is σ = 1212313218. Its totient is φ = 1212313216.

The previous prime is 1212313139. The next prime is 1212313229. The reversal of 1212313217 is 7123132121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 806048881 + 406264336 = 28391^2 + 20156^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212313217 - 2²⁰ = 1211264641 is a prime.

It is a super-2 number, since 2×1212313217² = 2939406672225778178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212313192 and 1212313201.

It is not a weakly prime, because it can be changed into another prime (1212313237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606156608 + 606156609.

It is an arithmetic number, because the mean of its divisors is an integer number (606156609).

Almost surely, 2^1212313217 is an apocalyptic number.

It is an amenable number.

1212313217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212313217 is an equidigital number, since it uses as much as digits as its factorization.

1212313217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 23.

The square root of 1212313217 is about 34818.2885420866. The cubic root of 1212313217 is about 1066.2808593766.

Adding to 1212313217 its reverse (7123132121), we get a palindrome (8335445338).

The spelling of 1212313217 in words is "one billion, two hundred twelve million, three hundred thirteen thousand, two hundred seventeen".