2011531811 has 2 divisors, whose sum is σ = 2011531812. Its totient is φ = 2011531810.

The previous prime is 2011531807. The next prime is 2011531829. The reversal of 2011531811 is 1181351102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2011531811 - 2² = 2011531807 is a prime.

It is not a weakly prime, because it can be changed into another prime (2011531831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005765905 + 1005765906.

It is an arithmetic number, because the mean of its divisors is an integer number (1005765906).

Almost surely, 2^2011531811 is an apocalyptic number.

2011531811 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011531811 is an equidigital number, since it uses as much as digits as its factorization.

2011531811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 23.

The square root of 2011531811 is about 44850.1038014406. The cubic root of 2011531811 is about 1262.3379392150.

Adding to 2011531811 its reverse (1181351102), we get a palindrome (3192882913).

The spelling of 2011531811 in words is "two billion, eleven million, five hundred thirty-one thousand, eight hundred eleven".