1311241533513 has 4 divisors (see below), whose sum is σ = 1748322044688. Its totient is φ = 874161022340.

The previous prime is 1311241533467. The next prime is 1311241533527. The reversal of 1311241533513 is 3153351421131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1311241533513 - 2²⁰ = 1311240484937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311241533533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218540255583 + ... + 218540255588.

It is an arithmetic number, because the mean of its divisors is an integer number (437080511172).

Almost surely, 2^{1311241533513} is an apocalyptic number.

It is an amenable number.

1311241533513 is a deficient number, since it is larger than the sum of its proper divisors (437080511175).

1311241533513 is an equidigital number, since it uses as much as digits as its factorization.

1311241533513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437080511174.

The product of its digits is 16200, while the sum is 33.

Adding to 1311241533513 its reverse (3153351421131), we get a palindrome (4464592954644).

The spelling of 1311241533513 in words is "one trillion, three hundred eleven billion, two hundred forty-one million, five hundred thirty-three thousand, five hundred thirteen".