1311040344413 has 4 divisors (see below), whose sum is σ = 1317695371740. Its totient is φ = 1304385317088.

The previous prime is 1311040344409. The next prime is 1311040344457. The reversal of 1311040344413 is 3144430401131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 643417349689 + 667622994724 = 802133^2 + 817082^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311040344413 - 2² = 1311040344409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311040344473) 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, 3327513368 + ... + 3327513761.

It is an arithmetic number, because the mean of its divisors is an integer number (329423842935).

Almost surely, 2^{1311040344413} is an apocalyptic number.

It is an amenable number.

1311040344413 is a deficient number, since it is larger than the sum of its proper divisors (6655027327).

1311040344413 is an equidigital number, since it uses as much as digits as its factorization.

1311040344413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6655027326.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 1311040344413 its reverse (3144430401131), we get a palindrome (4455470745544).

The spelling of 1311040344413 in words is "one trillion, three hundred eleven billion, forty million, three hundred forty-four thousand, four hundred thirteen".