1123209011 has 2 divisors, whose sum is σ = 1123209012. Its totient is φ = 1123209010.

The previous prime is 1123209007. The next prime is 1123209013. The reversal of 1123209011 is 1109023211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1123209011 - 2² = 1123209007 is a prime.

Together with 1123209013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1123209013) 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, 561604505 + 561604506.

It is an arithmetic number, because the mean of its divisors is an integer number (561604506).

Almost surely, 2^1123209011 is an apocalyptic number.

1123209011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123209011 is an equidigital number, since it uses as much as digits as its factorization.

1123209011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1123209011 is about 33514.3105404244. The cubic root of 1123209011 is about 1039.4897062024.

The spelling of 1123209011 in words is "one billion, one hundred twenty-three million, two hundred nine thousand, eleven".