3685181 has 4 divisors (see below), whose sum is σ = 3719100. Its totient is φ = 3651264.

The previous prime is 3685169. The next prime is 3685211. The reversal of 3685181 is 1815863.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2325625 + 1359556 = 1525^2 + 1166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3685181 is a prime.

It is a super-2 number, since 2×3685181² = 27161118005522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3685111) 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 3 ways as a sum of consecutive naturals, for example, 16796 + ... + 17013.

It is an arithmetic number, because the mean of its divisors is an integer number (929775).

Almost surely, 2^3685181 is an apocalyptic number.

It is an amenable number.

3685181 is a deficient number, since it is larger than the sum of its proper divisors (33919).

3685181 is a wasteful number, since it uses less digits than its factorization.

3685181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33918.

The product of its digits is 5760, while the sum is 32.

The square root of 3685181 is about 1919.6825258360. The cubic root of 3685181 is about 154.4612722934.

The spelling of 3685181 in words is "three million, six hundred eighty-five thousand, one hundred eighty-one".