989901109989 has 72 divisors (see below), whose sum is σ = 1613253146232. Its totient is φ = 584258400000.

The previous prime is 989901109973. The next prime is 989901109991.

989901109989 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 6531387489 + 983369722500 = 80817^2 + 991650^2 .

It is not a de Polignac number, because 989901109989 - 2⁴ = 989901109973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989901109789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6635559 + ... + 6783099.

Almost surely, 2^989901109989 is an apocalyptic number.

989901109989 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

989901109989 is a deficient number, since it is larger than the sum of its proper divisors (623352036243).

989901109989 is a wasteful number, since it uses less digits than its factorization.

989901109989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147731 (or 147717 counting only the distinct ones).

The product of its (nonzero) digits is 34012224, while the sum is 72.

It can be divided in two parts, 98990110 and 9989, that added together give a palindrome (99000099).

The spelling of 989901109989 in words is "nine hundred eighty-nine billion, nine hundred one million, one hundred nine thousand, nine hundred eighty-nine".