1311234331243 has 4 divisors (see below), whose sum is σ = 1353532212928. Its totient is φ = 1268936449560.

The previous prime is 1311234331229. The next prime is 1311234331249. The reversal of 1311234331243 is 3421334321131.

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 1311234331243 - 2²⁵ = 1311200776811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 42297881653 = 1311234331243 / (1 + 3 + 1 + 1 + 2 + 3 + 4 + 3 + 3 + 1 + 2 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311234331249) 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, 21148940796 + ... + 21148940857.

It is an arithmetic number, because the mean of its divisors is an integer number (338383053232).

Almost surely, 2^{1311234331243} is an apocalyptic number.

1311234331243 is a deficient number, since it is larger than the sum of its proper divisors (42297881685).

1311234331243 is an equidigital number, since it uses as much as digits as its factorization.

1311234331243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42297881684.

The product of its digits is 15552, while the sum is 31.

Adding to 1311234331243 its reverse (3421334321131), we get a palindrome (4732568652374).

The spelling of 1311234331243 in words is "one trillion, three hundred eleven billion, two hundred thirty-four million, three hundred thirty-one thousand, two hundred forty-three".