1331231311 has 2 divisors, whose sum is σ = 1331231312. Its totient is φ = 1331231310.

The previous prime is 1331231309. The next prime is 1331231339. The reversal of 1331231311 is 1131321331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1331231311 - 2¹ = 1331231309 is a prime.

Together with 1331231309, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331231351) 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 as a sum of consecutive naturals, namely, 665615655 + 665615656.

It is an arithmetic number, because the mean of its divisors is an integer number (665615656).

Almost surely, 2^1331231311 is an apocalyptic number.

1331231311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331231311 is an equidigital number, since it uses as much as digits as its factorization.

1331231311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 19.

The square root of 1331231311 is about 36486.0426875812. The cubic root of 1331231311 is about 1100.0637183476.

Adding to 1331231311 its reverse (1131321331), we get a palindrome (2462552642).

The spelling of 1331231311 in words is "one billion, three hundred thirty-one million, two hundred thirty-one thousand, three hundred eleven".