1231222131313 has 2 divisors, whose sum is σ = 1231222131314. Its totient is φ = 1231222131312.

The previous prime is 1231222131281. The next prime is 1231222131343. The reversal of 1231222131313 is 3131312221321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 740783833344 + 490438297969 = 860688^2 + 700313^2 .

It is an emirp because it is prime and its reverse (3131312221321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231222131313 - 2⁵ = 1231222131281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231222131343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615611065656 + 615611065657.

It is an arithmetic number, because the mean of its divisors is an integer number (615611065657).

Almost surely, 2^{1231222131313} is an apocalyptic number.

It is an amenable number.

1231222131313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231222131313 is an equidigital number, since it uses as much as digits as its factorization.

1231222131313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

Adding to 1231222131313 its reverse (3131312221321), we get a palindrome (4362534352634).

The spelling of 1231222131313 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-two million, one hundred thirty-one thousand, three hundred thirteen".