11391904849 has 6 divisors (see below), whose sum is σ = 12335613126. Its totient is φ = 10515604320.

The previous prime is 11391904829. The next prime is 11391904883. The reversal of 11391904849 is 94840919311.

It can be written as a sum of positive squares in 3 ways, for example, as 1643897025 + 9748007824 = 40545^2 + 98732^2 .

It is not a de Polignac number, because 11391904849 - 2⁷ = 11391904721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11391904829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33703692 + ... + 33704029.

It is an arithmetic number, because the mean of its divisors is an integer number (2055935521).

Almost surely, 2^11391904849 is an apocalyptic number.

It is an amenable number.

11391904849 is a deficient number, since it is larger than the sum of its proper divisors (943708277).

11391904849 is an equidigital number, since it uses as much as digits as its factorization.

11391904849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67407747 (or 67407734 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 49.

The spelling of 11391904849 in words is "eleven billion, three hundred ninety-one million, nine hundred four thousand, eight hundred forty-nine".