1311313321231 has 4 divisors (see below), whose sum is σ = 1312706853864. Its totient is φ = 1309919788600.

The previous prime is 1311313321183. The next prime is 1311313321271. The reversal of 1311313321231 is 1321233131131.

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 1311313321231 - 2²¹ = 1311311224079 is a prime.

It is a super-2 number, since 2×1311313321231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311313321196 and 1311313321205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311313321271) 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, 696764905 + ... + 696766786.

It is an arithmetic number, because the mean of its divisors is an integer number (328176713466).

Almost surely, 2^{1311313321231} is an apocalyptic number.

1311313321231 is a deficient number, since it is larger than the sum of its proper divisors (1393532633).

1311313321231 is an equidigital number, since it uses as much as digits as its factorization.

1311313321231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393532632.

The product of its digits is 972, while the sum is 25.

Adding to 1311313321231 its reverse (1321233131131), we get a palindrome (2632546452362).

The spelling of 1311313321231 in words is "one trillion, three hundred eleven billion, three hundred thirteen million, three hundred twenty-one thousand, two hundred thirty-one".