1231003311331 has 4 divisors (see below), whose sum is σ = 1231009188192. Its totient is φ = 1230997434472.

The previous prime is 1231003311319. The next prime is 1231003311337. The reversal of 1231003311331 is 1331133001321.

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 1231003311331 - 2⁵ = 1231003311299 is a prime.

It is a super-3 number, since 3×1231003311331³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231003311337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2612155 + ... + 3047188.

It is an arithmetic number, because the mean of its divisors is an integer number (307752297048).

Almost surely, 2^{1231003311331} is an apocalyptic number.

1231003311331 is a deficient number, since it is larger than the sum of its proper divisors (5876861).

1231003311331 is an equidigital number, since it uses as much as digits as its factorization.

1231003311331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876860.

The product of its (nonzero) digits is 486, while the sum is 22.

Adding to 1231003311331 its reverse (1331133001321), we get a palindrome (2562136312652).

The spelling of 1231003311331 in words is "one trillion, two hundred thirty-one billion, three million, three hundred eleven thousand, three hundred thirty-one".