11249688209 has 4 divisors (see below), whose sum is σ = 11250205680. Its totient is φ = 11249170740.

The previous prime is 11249688193. The next prime is 11249688253. The reversal of 11249688209 is 90288694211.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90288694211 = 32603 ⋅2769337.

It is a cyclic number.

It is not a de Polignac number, because 11249688209 - 2⁴ = 11249688193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11249682209) 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, 224627 + ... + 270104.

It is an arithmetic number, because the mean of its divisors is an integer number (2812551420).

Almost surely, 2^11249688209 is an apocalyptic number.

It is an amenable number.

11249688209 is a deficient number, since it is larger than the sum of its proper divisors (517471).

11249688209 is an equidigital number, since it uses as much as digits as its factorization.

11249688209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517470.

The product of its (nonzero) digits is 497664, while the sum is 50.

The spelling of 11249688209 in words is "eleven billion, two hundred forty-nine million, six hundred eighty-eight thousand, two hundred nine".