4891099365889 has 27 divisors (see below), whose sum is σ = 5429770911201. Its totient is φ = 4402554046440.

The previous prime is 4891099365871. The next prime is 4891099365917. The reversal of 4891099365889 is 9885639901984.

The square root of 4891099365889 is 2211583.

It is a perfect power (a square), and thus also a powerful number.

4891099365889 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4891099365889 - 2³⁵ = 4856739627521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4891099365389) 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 26 ways as a sum of consecutive naturals, for example, 2603032252 + ... + 2603034130.

Almost surely, 2^{4891099365889} is an apocalyptic number.

4891099365889 is the 2211583-rd square number.

4891099365889 is the 1105792-nd centered octagonal number.

It is an amenable number.

4891099365889 is a deficient number, since it is larger than the sum of its proper divisors (538671545312).

4891099365889 is an frugal number, since it uses more digits than its factorization.

4891099365889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994 (or 1997 counting only the distinct ones).

The product of its (nonzero) digits is 1209323520, while the sum is 79.

The spelling of 4891099365889 in words is "four trillion, eight hundred ninety-one billion, ninety-nine million, three hundred sixty-five thousand, eight hundred eighty-nine".