1231303211311 has 2 divisors, whose sum is σ = 1231303211312. Its totient is φ = 1231303211310.

The previous prime is 1231303211309. The next prime is 1231303211317. The reversal of 1231303211311 is 1131123031321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231303211311 - 2¹ = 1231303211309 is a prime.

It is a super-2 number, since 2×1231303211311² (a number of 25 digits) contains 22 as substring.

Together with 1231303211309, 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 (1231303211317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615651605655 + 615651605656.

It is an arithmetic number, because the mean of its divisors is an integer number (615651605656).

Almost surely, 2^{1231303211311} is an apocalyptic number.

1231303211311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231303211311 is an equidigital number, since it uses as much as digits as its factorization.

1231303211311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 1231303211311 its reverse (1131123031321), we get a palindrome (2362426242632).

The spelling of 1231303211311 in words is "one trillion, two hundred thirty-one billion, three hundred three million, two hundred eleven thousand, three hundred eleven".