2011331240309 has 2 divisors, whose sum is σ = 2011331240310. Its totient is φ = 2011331240308.

The previous prime is 2011331240251. The next prime is 2011331240311. The reversal of 2011331240309 is 9030421331102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1862105868100 + 149225372209 = 1364590^2 + 386297^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011331240309 - 2³² = 2007036273013 is a prime.

It is a Sophie Germain prime.

Together with 2011331240311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011331240329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005665620154 + 1005665620155.

It is an arithmetic number, because the mean of its divisors is an integer number (1005665620155).

Almost surely, 2^{2011331240309} is an apocalyptic number.

It is an amenable number.

2011331240309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011331240309 is an equidigital number, since it uses as much as digits as its factorization.

2011331240309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 2011331240309 in words is "two trillion, eleven billion, three hundred thirty-one million, two hundred forty thousand, three hundred nine".