1189118987 has 32 divisors (see below), whose sum is σ = 1490718720. Its totient is φ = 926432640.

The previous prime is 1189118969. The next prime is 1189118999. The reversal of 1189118987 is 7898119811.

It is a de Polignac number, because none of the positive numbers 2^k-1189118987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1189118687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230288 + ... + 235394.

It is an arithmetic number, because the mean of its divisors is an integer number (46584960).

Almost surely, 2^1189118987 is an apocalyptic number.

1189118987 is a deficient number, since it is larger than the sum of its proper divisors (301599733).

1189118987 is a wasteful number, since it uses less digits than its factorization.

1189118987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5211.

The product of its digits is 290304, while the sum is 53.

The square root of 1189118987 is about 34483.6046114672. The cubic root of 1189118987 is about 1059.4369226712.

The spelling of 1189118987 in words is "one billion, one hundred eighty-nine million, one hundred eighteen thousand, nine hundred eighty-seven".