9665181 has 6 divisors (see below), whose sum is σ = 13960830. Its totient is φ = 6443448.

The previous prime is 9665143. The next prime is 9665189. The reversal of 9665181 is 1815669.

It can be written as a sum of positive squares in only one way, i.e., 8732025 + 933156 = 2955^2 + 966^2 .

It is not a de Polignac number, because 9665181 - 2¹⁹ = 9140893 is a prime.

It is a super-2 number, since 2×9665181² = 186831447525522, which contains 22 as substring.

9665181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9665189) 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, 536946 + ... + 536963.

It is an arithmetic number, because the mean of its divisors is an integer number (2326805).

Almost surely, 2^9665181 is an apocalyptic number.

It is an amenable number.

9665181 is a deficient number, since it is larger than the sum of its proper divisors (4295649).

9665181 is a wasteful number, since it uses less digits than its factorization.

9665181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073915 (or 1073912 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 9665181 is about 3108.8874215706. The cubic root of 9665181 is about 213.0116372667.

The spelling of 9665181 in words is "nine million, six hundred sixty-five thousand, one hundred eighty-one".