11247238809 has 81 divisors (see below), whose sum is σ = 17927015197. Its totient is φ = 6794179392.

The previous prime is 11247238801. The next prime is 11247238813. The reversal of 11247238809 is 90883274211.

It is a happy number.

The square root of 11247238809 is 106053.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 705699225 + 10541539584 = 26565^2 + 102672^2 .

It is not a de Polignac number, because 11247238809 - 2³ = 11247238801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11247238801) 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 80 ways as a sum of consecutive naturals, for example, 212212027 + ... + 212212079.

Almost surely, 2^11247238809 is an apocalyptic number.

11247238809 is the 106053-rd square number.

11247238809 is the 53027-th centered octagonal number.

It is an amenable number.

11247238809 is a deficient number, since it is larger than the sum of its proper divisors (6679776388).

11247238809 is an equidigital number, since it uses as much as digits as its factorization.

11247238809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 11247238809 in words is "eleven billion, two hundred forty-seven million, two hundred thirty-eight thousand, eight hundred nine".