1231331231111 has 2 divisors, whose sum is σ = 1231331231112. Its totient is φ = 1231331231110.

The previous prime is 1231331231087. The next prime is 1231331231171. The reversal of 1231331231111 is 1111321331321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231331231111 - 2⁶ = 1231331231047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231331231171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615665615555 + 615665615556.

It is an arithmetic number, because the mean of its divisors is an integer number (615665615556).

Almost surely, 2^{1231331231111} is an apocalyptic number.

1231331231111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231331231111 is an equidigital number, since it uses as much as digits as its factorization.

1231331231111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

Adding to 1231331231111 its reverse (1111321331321), we get a palindrome (2342652562432).

The spelling of 1231331231111 in words is "one trillion, two hundred thirty-one billion, three hundred thirty-one million, two hundred thirty-one thousand, one hundred eleven".