989791901 has 32 divisors (see below), whose sum is σ = 1254113280. Its totient is φ = 761644800.

The previous prime is 989791897. The next prime is 989791903. The reversal of 989791901 is 109197989.

It is not a de Polignac number, because 989791901 - 2² = 989791897 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989791903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260030 + ... + 263808.

It is an arithmetic number, because the mean of its divisors is an integer number (39191040).

Almost surely, 2^989791901 is an apocalyptic number.

It is an amenable number.

989791901 is a deficient number, since it is larger than the sum of its proper divisors (264321379).

989791901 is a wasteful number, since it uses less digits than its factorization.

989791901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905.

The product of its (nonzero) digits is 367416, while the sum is 53.

The square root of 989791901 is about 31460.9583611180. The cubic root of 989791901 is about 996.5856558552.

The spelling of 989791901 in words is "nine hundred eighty-nine million, seven hundred ninety-one thousand, nine hundred one".