1311243413 has 2 divisors, whose sum is σ = 1311243414. Its totient is φ = 1311243412.

The previous prime is 1311243397. The next prime is 1311243431. The reversal of 1311243413 is 3143421131.

Together with next prime (1311243431) 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., 704212369 + 607031044 = 26537^2 + 24638^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311243413 - 2⁴ = 1311243397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311243313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655621706 + 655621707.

It is an arithmetic number, because the mean of its divisors is an integer number (655621707).

Almost surely, 2^1311243413 is an apocalyptic number.

It is an amenable number.

1311243413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311243413 is an equidigital number, since it uses as much as digits as its factorization.

1311243413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 1311243413 is about 36211.0951643277. The cubic root of 1311243413 is about 1094.5302609071.

Adding to 1311243413 its reverse (3143421131), we get a palindrome (4454664544).

The spelling of 1311243413 in words is "one billion, three hundred eleven million, two hundred forty-three thousand, four hundred thirteen".