2012311111 has 2 divisors, whose sum is σ = 2012311112. Its totient is φ = 2012311110.

The previous prime is 2012311061. The next prime is 2012311123. The reversal of 2012311111 is 1111132102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2012311111 - 2⁷ = 2012310983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2012311091 and 2012311100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2012311141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006155555 + 1006155556.

It is an arithmetic number, because the mean of its divisors is an integer number (1006155556).

Almost surely, 2^2012311111 is an apocalyptic number.

2012311111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2012311111 is an equidigital number, since it uses as much as digits as its factorization.

2012311111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 2012311111 is about 44858.7907884285. The cubic root of 2012311111 is about 1262.5009348880.

Adding to 2012311111 its reverse (1111132102), we get a palindrome (3123443213).

The spelling of 2012311111 in words is "two billion, twelve million, three hundred eleven thousand, one hundred eleven".