1311201202331 has 16 divisors (see below), whose sum is σ = 1382369107680. Its totient is φ = 1242425184000.

The previous prime is 1311201202303. The next prime is 1311201202373. The reversal of 1311201202331 is 1332021021131.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311201202331 is a prime.

It is a super-2 number, since 2×1311201202331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311201207331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3029420 + ... + 3435081.

It is an arithmetic number, because the mean of its divisors is an integer number (86398069230).

Almost surely, 2^{1311201202331} is an apocalyptic number.

1311201202331 is a deficient number, since it is larger than the sum of its proper divisors (71167905349).

1311201202331 is an equidigital number, since it uses as much as digits as its factorization.

1311201202331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6464686.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1311201202331 its reverse (1332021021131), we get a palindrome (2643222223462).

The spelling of 1311201202331 in words is "one trillion, three hundred eleven billion, two hundred one million, two hundred two thousand, three hundred thirty-one".