2011122209 has 2 divisors, whose sum is σ = 2011122210. Its totient is φ = 2011122208.

The previous prime is 2011122173. The next prime is 2011122227. The reversal of 2011122209 is 9022211102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1028613184 + 982509025 = 32072^2 + 31345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011122209 is a prime.

It is a super-2 number, since 2×2011122209² = 8089225079066079362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2011122229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005561104 + 1005561105.

It is an arithmetic number, because the mean of its divisors is an integer number (1005561105).

Almost surely, 2^2011122209 is an apocalyptic number.

It is an amenable number.

2011122209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011122209 is an equidigital number, since it uses as much as digits as its factorization.

2011122209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 2011122209 is about 44845.5372250127. The cubic root of 2011122209 is about 1262.2522514087.

The spelling of 2011122209 in words is "two billion, eleven million, one hundred twenty-two thousand, two hundred nine".