11991184388 has 12 divisors (see below), whose sum is σ = 21170277660. Its totient is φ = 5942533632.

The previous prime is 11991184349. The next prime is 11991184453. The reversal of 11991184388 is 88348119911.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4495434304 + 7495750084 = 67048^2 + 86578^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13264133 + ... + 13265036.

It is an arithmetic number, because the mean of its divisors is an integer number (1764189805).

Almost surely, 2^11991184388 is an apocalyptic number.

It is an amenable number.

11991184388 is a deficient number, since it is larger than the sum of its proper divisors (9179093272).

11991184388 is a wasteful number, since it uses less digits than its factorization.

11991184388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26529286 (or 26529284 counting only the distinct ones).

The product of its digits is 497664, while the sum is 53.

The spelling of 11991184388 in words is "eleven billion, nine hundred ninety-one million, one hundred eighty-four thousand, three hundred eighty-eight".