1189728617391 has 12 divisors (see below), whose sum is σ = 1718521061400. Its totient is φ = 793141256400.

The previous prime is 1189728617377. The next prime is 1189728617417. The reversal of 1189728617391 is 1937168279811.

1189728617391 is a `hidden beast` number, since 1 + 1 + 8 + 9 + 7 + 2 + 8 + 617 + 3 + 9 + 1 = 666.

It is not a de Polignac number, because 1189728617391 - 2⁶ = 1189728617327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189728617351) 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 11 ways as a sum of consecutive naturals, for example, 226116 + ... + 1559033.

It is an arithmetic number, because the mean of its divisors is an integer number (143210088450).

Almost surely, 2^{1189728617391} is an apocalyptic number.

1189728617391 is a deficient number, since it is larger than the sum of its proper divisors (528792444009).

1189728617391 is a wasteful number, since it uses less digits than its factorization.

1189728617391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859206 (or 1859203 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 63.

The spelling of 1189728617391 in words is "one trillion, one hundred eighty-nine billion, seven hundred twenty-eight million, six hundred seventeen thousand, three hundred ninety-one".