1311240103231 has 4 divisors (see below), whose sum is σ = 1311243311952. Its totient is φ = 1311236894512.

The previous prime is 1311240103213. The next prime is 1311240103241. The reversal of 1311240103231 is 1323010421131.

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 1311240103231 - 2¹¹ = 1311240101183 is a prime.

It is a super-2 number, since 2×1311240103231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311240103241) 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, 883390 + ... + 1844683.

It is an arithmetic number, because the mean of its divisors is an integer number (327810827988).

Almost surely, 2^{1311240103231} is an apocalyptic number.

1311240103231 is a deficient number, since it is larger than the sum of its proper divisors (3208721).

1311240103231 is an equidigital number, since it uses as much as digits as its factorization.

1311240103231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3208720.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1311240103231 its reverse (1323010421131), we get a palindrome (2634250524362).

The spelling of 1311240103231 in words is "one trillion, three hundred eleven billion, two hundred forty million, one hundred three thousand, two hundred thirty-one".