9989181 has 6 divisors (see below), whose sum is σ = 14428830. Its totient is φ = 6659448.

The previous prime is 9989179. The next prime is 9989191. The reversal of 9989181 is 1819899.

9989181 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 5616900 + 4372281 = 2370^2 + 2091^2 .

It is not a de Polignac number, because 9989181 - 2¹ = 9989179 is a prime.

It is a super-2 number, since 2×9989181² = 199567474101522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9989171) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 554946 + ... + 554963.

It is an arithmetic number, because the mean of its divisors is an integer number (2404805).

Almost surely, 2^9989181 is an apocalyptic number.

It is an amenable number.

9989181 is a deficient number, since it is larger than the sum of its proper divisors (4439649).

9989181 is a wasteful number, since it uses less digits than its factorization.

9989181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109915 (or 1109912 counting only the distinct ones).

The product of its digits is 46656, while the sum is 45.

The square root of 9989181 is about 3160.5665631339. The cubic root of 9989181 is about 215.3657448702.

The spelling of 9989181 in words is "nine million, nine hundred eighty-nine thousand, one hundred eighty-one".