1311022217 has 2 divisors, whose sum is σ = 1311022218. Its totient is φ = 1311022216.

The previous prime is 1311022177. The next prime is 1311022247. The reversal of 1311022217 is 7122201131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1202424976 + 108597241 = 34676^2 + 10421^2 .

It is an emirp because it is prime and its reverse (7122201131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311022217 - 2¹⁰ = 1311021193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311022247) 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, 655511108 + 655511109.

It is an arithmetic number, because the mean of its divisors is an integer number (655511109).

Almost surely, 2^1311022217 is an apocalyptic number.

It is an amenable number.

1311022217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311022217 is an equidigital number, since it uses as much as digits as its factorization.

1311022217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 1311022217 is about 36208.0407782581. The cubic root of 1311022217 is about 1094.4687113560.

Adding to 1311022217 its reverse (7122201131), we get a palindrome (8433223348).

The spelling of 1311022217 in words is "one billion, three hundred eleven million, twenty-two thousand, two hundred seventeen".