1191138884 has 24 divisors (see below), whose sum is σ = 2276463168. Its totient is φ = 542011680.

The previous prime is 1191138863. The next prime is 1191138889. The reversal of 1191138884 is 4888311911.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1191138889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157622 + ... + 165005.

It is an arithmetic number, because the mean of its divisors is an integer number (94852632).

Almost surely, 2^1191138884 is an apocalyptic number.

It is an amenable number.

1191138884 is a deficient number, since it is larger than the sum of its proper divisors (1085324284).

1191138884 is a wasteful number, since it uses less digits than its factorization.

1191138884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322715 (or 322713 counting only the distinct ones).

The product of its digits is 55296, while the sum is 44.

The square root of 1191138884 is about 34512.8799725552. The cubic root of 1191138884 is about 1060.0364541871.

The spelling of 1191138884 in words is "one billion, one hundred ninety-one million, one hundred thirty-eight thousand, eight hundred eighty-four".