1311513215311 has 4 divisors (see below), whose sum is σ = 1412398847272. Its totient is φ = 1210627583352.

The previous prime is 1311513215249. The next prime is 1311513215377. The reversal of 1311513215311 is 1135123151131.

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

It is a cyclic number.

It is not a de Polignac number, because 1311513215311 - 2¹⁹ = 1311512691023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311513215311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311513219311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50442815961 + ... + 50442815986.

It is an arithmetic number, because the mean of its divisors is an integer number (353099711818).

Almost surely, 2^{1311513215311} is an apocalyptic number.

1311513215311 is a deficient number, since it is larger than the sum of its proper divisors (100885631961).

1311513215311 is a wasteful number, since it uses less digits than its factorization.

1311513215311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100885631960.

The product of its digits is 1350, while the sum is 28.

Adding to 1311513215311 its reverse (1135123151131), we get a palindrome (2446636366442).

The spelling of 1311513215311 in words is "one trillion, three hundred eleven billion, five hundred thirteen million, two hundred fifteen thousand, three hundred eleven".