9913181 has 8 divisors (see below), whose sum is σ = 10109880. Its totient is φ = 9718272.

The previous prime is 9913153. The next prime is 9913187. The reversal of 9913181 is 1813199.

It can be written as a sum of positive squares in 4 ways, for example, as 4553956 + 5359225 = 2134^2 + 2315^2 .

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-9913181 is a prime.

It is a super-2 number, since 2×9913181² = 196542315077522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9913187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16421 + ... + 17013.

It is an arithmetic number, because the mean of its divisors is an integer number (1263735).

Almost surely, 2^9913181 is an apocalyptic number.

It is an amenable number.

9913181 is a deficient number, since it is larger than the sum of its proper divisors (196699).

9913181 is a wasteful number, since it uses less digits than its factorization.

9913181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895.

The product of its digits is 1944, while the sum is 32.

The square root of 9913181 is about 3148.5204461779. The cubic root of 9913181 is about 214.8181696834.

The spelling of 9913181 in words is "nine million, nine hundred thirteen thousand, one hundred eighty-one".