1311242431 has 2 divisors, whose sum is σ = 1311242432. Its totient is φ = 1311242430.

The previous prime is 1311242363. The next prime is 1311242467. The reversal of 1311242431 is 1342421131.

It is a strong prime.

It is an emirp because it is prime and its reverse (1342421131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311242431 is a prime.

It is a super-2 number, since 2×1311242431² = 3438713425709579522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311242131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655621215 + 655621216.

It is an arithmetic number, because the mean of its divisors is an integer number (655621216).

Almost surely, 2^1311242431 is an apocalyptic number.

1311242431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311242431 is an equidigital number, since it uses as much as digits as its factorization.

1311242431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 22.

The square root of 1311242431 is about 36211.0816049452. The cubic root of 1311242431 is about 1094.5299876731.

Adding to 1311242431 its reverse (1342421131), we get a palindrome (2653663562).

The spelling of 1311242431 in words is "one billion, three hundred eleven million, two hundred forty-two thousand, four hundred thirty-one".