11131122209 has 2 divisors, whose sum is σ = 11131122210. Its totient is φ = 11131122208.

The previous prime is 11131122173. The next prime is 11131122239. The reversal of 11131122209 is 90222113111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9939491809 + 1191630400 = 99697^2 + 34520^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131122209 - 2¹² = 11131118113 is a prime.

It is not a weakly prime, because it can be changed into another prime (11131122239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565561104 + 5565561105.

It is an arithmetic number, because the mean of its divisors is an integer number (5565561105).

Almost surely, 2^11131122209 is an apocalyptic number.

It is an amenable number.

11131122209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131122209 is an equidigital number, since it uses as much as digits as its factorization.

11131122209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 11131122209 in words is "eleven billion, one hundred thirty-one million, one hundred twenty-two thousand, two hundred nine".