1243110313 has 2 divisors, whose sum is σ = 1243110314. Its totient is φ = 1243110312.

The previous prime is 1243110307. The next prime is 1243110331. The reversal of 1243110313 is 3130113421.

Together with next prime (1243110331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1026049024 + 217061289 = 32032^2 + 14733^2 .

It is an emirp because it is prime and its reverse (3130113421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243110313 - 2⁹ = 1243109801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243110343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621555156 + 621555157.

It is an arithmetic number, because the mean of its divisors is an integer number (621555157).

Almost surely, 2^1243110313 is an apocalyptic number.

It is an amenable number.

1243110313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243110313 is an equidigital number, since it uses as much as digits as its factorization.

1243110313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1243110313 is about 35257.7695409111. The cubic root of 1243110313 is about 1075.2345802840.

Adding to 1243110313 its reverse (3130113421), we get a palindrome (4373223734).

It can be divided in two parts, 1243 and 110313, that added together give a square (111556 = 334²).

The spelling of 1243110313 in words is "one billion, two hundred forty-three million, one hundred ten thousand, three hundred thirteen".