1311526241 has 2 divisors, whose sum is σ = 1311526242. Its totient is φ = 1311526240.

The previous prime is 1311526219. The next prime is 1311526253. The reversal of 1311526241 is 1426251131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1311526225 + 16 = 36215^2 + 4^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311526241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311526241.

It is not a weakly prime, because it can be changed into another prime (1311526201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655763120 + 655763121.

It is an arithmetic number, because the mean of its divisors is an integer number (655763121).

Almost surely, 2^1311526241 is an apocalyptic number.

It is an amenable number.

1311526241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311526241 is an equidigital number, since it uses as much as digits as its factorization.

1311526241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 1311526241 is about 36215.0002209029. Note that the first 3 decimals coincide. The cubic root of 1311526241 is about 1094.6089499711.

Adding to 1311526241 its reverse (1426251131), we get a palindrome (2737777372).

The spelling of 1311526241 in words is "one billion, three hundred eleven million, five hundred twenty-six thousand, two hundred forty-one".