11931208449 has 16 divisors (see below), whose sum is σ = 16525153920. Its totient is φ = 7647978240.

The previous prime is 11931208433. The next prime is 11931208451. The reversal of 11931208449 is 94480213911.

It is not a de Polignac number, because 11931208449 - 2⁴ = 11931208433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11931208449.

It is not an unprimeable number, because it can be changed into a prime (11931208459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263557 + ... + 305490.

It is an arithmetic number, because the mean of its divisors is an integer number (1032822120).

Almost surely, 2^11931208449 is an apocalyptic number.

It is an amenable number.

11931208449 is a deficient number, since it is larger than the sum of its proper divisors (4593945471).

11931208449 is a wasteful number, since it uses less digits than its factorization.

11931208449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569320.

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 11931208449 in words is "eleven billion, nine hundred thirty-one million, two hundred eight thousand, four hundred forty-nine".