11131201209 has 4 divisors (see below), whose sum is σ = 14841601616. Its totient is φ = 7420800804.

The previous prime is 11131201201. The next prime is 11131201229. The reversal of 11131201209 is 90210213111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11131201209 - 2³ = 11131201201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11131201201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1855200199 + ... + 1855200204.

It is an arithmetic number, because the mean of its divisors is an integer number (3710400404).

Almost surely, 2^11131201209 is an apocalyptic number.

It is an amenable number.

11131201209 is a deficient number, since it is larger than the sum of its proper divisors (3710400407).

11131201209 is an equidigital number, since it uses as much as digits as its factorization.

11131201209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710400406.

The product of its (nonzero) digits is 108, while the sum is 21.

The spelling of 11131201209 in words is "eleven billion, one hundred thirty-one million, two hundred one thousand, two hundred nine".