1191734128 has 20 divisors (see below), whose sum is σ = 2486599528. Its totient is φ = 550031040.

The previous prime is 1191734099. The next prime is 1191734161. The reversal of 1191734128 is 8214371911.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2864538 + ... + 2864953.

Almost surely, 2^1191734128 is an apocalyptic number.

It is an amenable number.

1191734128 is an abundant number, since it is smaller than the sum of its proper divisors (1294865400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1191734128 is a wasteful number, since it uses less digits than its factorization.

1191734128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5729512 (or 5729506 counting only the distinct ones).

The product of its digits is 12096, while the sum is 37.

The square root of 1191734128 is about 34521.5024006778. The cubic root of 1191734128 is about 1060.2130009836.

The spelling of 1191734128 in words is "one billion, one hundred ninety-one million, seven hundred thirty-four thousand, one hundred twenty-eight".