1311331323031 has 2 divisors, whose sum is σ = 1311331323032. Its totient is φ = 1311331323030.

The previous prime is 1311331323023. The next prime is 1311331323053. The reversal of 1311331323031 is 1303231331131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311331323031 - 2³ = 1311331323023 is a prime.

It is a super-2 number, since 2×1311331323031² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311331322987 and 1311331323005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311331323331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655665661515 + 655665661516.

It is an arithmetic number, because the mean of its divisors is an integer number (655665661516).

Almost surely, 2^{1311331323031} is an apocalyptic number.

1311331323031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311331323031 is an equidigital number, since it uses as much as digits as its factorization.

1311331323031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 25.

Adding to 1311331323031 its reverse (1303231331131), we get a palindrome (2614562654162).

The spelling of 1311331323031 in words is "one trillion, three hundred eleven billion, three hundred thirty-one million, three hundred twenty-three thousand, thirty-one".