9998181 has 16 divisors (see below), whose sum is σ = 14867200. Its totient is φ = 6640704.

The previous prime is 9998179. The next prime is 9998201. The reversal of 9998181 is 1818999.

9998181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9998181 - 2¹ = 9998179 is a prime.

It is a super-2 number, since 2×9998181² = 199927246617522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

9998181 is a modest number, since divided by 8181 gives 999 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9405 + ... + 10413.

It is an arithmetic number, because the mean of its divisors is an integer number (929200).

Almost surely, 2^9998181 is an apocalyptic number.

It is an amenable number.

9998181 is a deficient number, since it is larger than the sum of its proper divisors (4869019).

9998181 is a wasteful number, since it uses less digits than its factorization.

9998181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385 (or 1379 counting only the distinct ones).

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

The square root of 9998181 is about 3161.9900379350. The cubic root of 9998181 is about 215.4304051554.

It can be divided in two parts, 999 and 8181, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 9998181 in words is "nine million, nine hundred ninety-eight thousand, one hundred eighty-one".