1311535241 has 2 divisors, whose sum is σ = 1311535242. Its totient is φ = 1311535240.

The previous prime is 1311535229. The next prime is 1311535271. The reversal of 1311535241 is 1425351131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 888040000 + 423495241 = 29800^2 + 20579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311535241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311535241.

It is not a weakly prime, because it can be changed into another prime (1311535271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655767620 + 655767621.

It is an arithmetic number, because the mean of its divisors is an integer number (655767621).

Almost surely, 2^1311535241 is an apocalyptic number.

It is an amenable number.

1311535241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311535241 is an equidigital number, since it uses as much as digits as its factorization.

1311535241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 1311535241 is about 36215.1244785932. The cubic root of 1311535241 is about 1094.6114537863.

Adding to 1311535241 its reverse (1425351131), we get a palindrome (2736886372).

The spelling of 1311535241 in words is "one billion, three hundred eleven million, five hundred thirty-five thousand, two hundred forty-one".