9985181 has 8 divisors (see below), whose sum is σ = 10281600. Its totient is φ = 9691360.

The previous prime is 9985169. The next prime is 9985187. The reversal of 9985181 is 1815899.

9985181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9985181 is a prime.

It is a super-2 number, since 2×9985181² = 199407679205522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9985187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9290 + ... + 10308.

It is an arithmetic number, because the mean of its divisors is an integer number (1285200).

Almost surely, 2^9985181 is an apocalyptic number.

It is an amenable number.

9985181 is a deficient number, since it is larger than the sum of its proper divisors (296419).

9985181 is a wasteful number, since it uses less digits than its factorization.

9985181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299.

The product of its digits is 25920, while the sum is 41.

The square root of 9985181 is about 3159.9337018362. The cubic root of 9985181 is about 215.3369944988.

The spelling of 9985181 in words is "nine million, nine hundred eighty-five thousand, one hundred eighty-one".