11203312009 has 4 divisors (see below), whose sum is σ = 11205266500. Its totient is φ = 11201357520.

The previous prime is 11203311947. The next prime is 11203312031. The reversal of 11203312009 is 90021330211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5296928400 + 5906383609 = 72780^2 + 76853^2 .

It is a cyclic number.

It is not a de Polignac number, because 11203312009 - 2²³ = 11194923401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11203312039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968622 + ... + 980119.

It is an arithmetic number, because the mean of its divisors is an integer number (2801316625).

Almost surely, 2^11203312009 is an apocalyptic number.

It is an amenable number.

11203312009 is a deficient number, since it is larger than the sum of its proper divisors (1954491).

11203312009 is an equidigital number, since it uses as much as digits as its factorization.

11203312009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954490.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 11203312009 in words is "eleven billion, two hundred three million, three hundred twelve thousand, nine".