1311531523323 has 16 divisors (see below), whose sum is σ = 2025901272576. Its totient is φ = 739180192320.

The previous prime is 1311531523301. The next prime is 1311531523349. The reversal of 1311531523323 is 3233251351131.

It is not a de Polignac number, because 1311531523323 - 2⁸ = 1311531523067 is a prime.

It is a super-3 number, since 3×1311531523323³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1311531523223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427764783 + ... + 427767848.

It is an arithmetic number, because the mean of its divisors is an integer number (126618829536).

Almost surely, 2^{1311531523323} is an apocalyptic number.

1311531523323 is a deficient number, since it is larger than the sum of its proper divisors (714369749253).

1311531523323 is an equidigital number, since it uses as much as digits as its factorization.

1311531523323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855532714.

The product of its digits is 24300, while the sum is 33.

Adding to 1311531523323 its reverse (3233251351131), we get a palindrome (4544782874454).

The spelling of 1311531523323 in words is "one trillion, three hundred eleven billion, five hundred thirty-one million, five hundred twenty-three thousand, three hundred twenty-three".