1312222217 has 2 divisors, whose sum is σ = 1312222218. Its totient is φ = 1312222216.

The previous prime is 1312222193. The next prime is 1312222237. The reversal of 1312222217 is 7122222131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1300035136 + 12187081 = 36056^2 + 3491^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312222217 - 2²⁴ = 1295445001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312222192 and 1312222201.

It is not a weakly prime, because it can be changed into another prime (1312222237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656111108 + 656111109.

It is an arithmetic number, because the mean of its divisors is an integer number (656111109).

Almost surely, 2^1312222217 is an apocalyptic number.

It is an amenable number.

1312222217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312222217 is an equidigital number, since it uses as much as digits as its factorization.

1312222217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 1312222217 is about 36224.6078929779. The cubic root of 1312222217 is about 1094.8025378735.

Adding to 1312222217 its reverse (7122222131), we get a palindrome (8434444348).

The spelling of 1312222217 in words is "one billion, three hundred twelve million, two hundred twenty-two thousand, two hundred seventeen".