1191161328 has 40 divisors (see below), whose sum is σ = 3516763008. Its totient is φ = 340331712.

The previous prime is 1191161327. The next prime is 1191161339. The reversal of 1191161328 is 8231611911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191161327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1772226 + ... + 1772897.

Almost surely, 2^1191161328 is an apocalyptic number.

It is an amenable number.

1191161328 is an abundant number, since it is smaller than the sum of its proper divisors (2325601680).

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

1191161328 is a wasteful number, since it uses less digits than its factorization.

1191161328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545141 (or 3545135 counting only the distinct ones).

The product of its digits is 2592, while the sum is 33.

The square root of 1191161328 is about 34513.2051249953. The cubic root of 1191161328 is about 1060.0431120474.

The spelling of 1191161328 in words is "one billion, one hundred ninety-one million, one hundred sixty-one thousand, three hundred twenty-eight".