1311243103 has 2 divisors, whose sum is σ = 1311243104. Its totient is φ = 1311243102.

The previous prime is 1311243071. The next prime is 1311243107. The reversal of 1311243103 is 3013421131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311243103 - 2⁵ = 1311243071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311243107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655621551 + 655621552.

It is an arithmetic number, because the mean of its divisors is an integer number (655621552).

Almost surely, 2^1311243103 is an apocalyptic number.

1311243103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311243103 is an equidigital number, since it uses as much as digits as its factorization.

1311243103 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1311243103 is about 36211.0908838715. The cubic root of 1311243103 is about 1094.5301746520.

Adding to 1311243103 its reverse (3013421131), we get a palindrome (4324664234).

The spelling of 1311243103 in words is "one billion, three hundred eleven million, two hundred forty-three thousand, one hundred three".