231020133311111 has 2 divisors, whose sum is σ = 231020133311112. Its totient is φ = 231020133311110.

The previous prime is 231020133311089. The next prime is 231020133311141. The reversal of 231020133311111 is 111113331020132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231020133311111 - 2³⁴ = 231002953441927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231020133311141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115510066655555 + 115510066655556.

It is an arithmetic number, because the mean of its divisors is an integer number (115510066655556).

Almost surely, 2^{231020133311111} is an apocalyptic number.

231020133311111 is a deficient number, since it is larger than the sum of its proper divisors (1).

231020133311111 is an equidigital number, since it uses as much as digits as its factorization.

231020133311111 is an odious number, because the sum of its binary digits is odd.

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

Adding to 231020133311111 its reverse (111113331020132), we get a palindrome (342133464331243).

The spelling of 231020133311111 in words is "two hundred thirty-one trillion, twenty billion, one hundred thirty-three million, three hundred eleven thousand, one hundred eleven".