1189112661 has 24 divisors (see below), whose sum is σ = 1897484160. Its totient is φ = 711547200.

The previous prime is 1189112647. The next prime is 1189112689. The reversal of 1189112661 is 1662119811.

It is a happy number.

It is not a de Polignac number, because 1189112661 - 2¹⁴ = 1189096277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189112161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68200 + ... + 83841.

It is an arithmetic number, because the mean of its divisors is an integer number (79061840).

Almost surely, 2^1189112661 is an apocalyptic number.

1189112661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1189112661 is a deficient number, since it is larger than the sum of its proper divisors (708371499).

1189112661 is a wasteful number, since it uses less digits than its factorization.

1189112661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152137 (or 152134 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 1189112661 is about 34483.5128865955. The cubic root of 1189112661 is about 1059.4350439667.

The spelling of 1189112661 in words is "one billion, one hundred eighty-nine million, one hundred twelve thousand, six hundred sixty-one".