3689181 has 6 divisors (see below), whose sum is σ = 5328830. Its totient is φ = 2459448.

The previous prime is 3689149. The next prime is 3689183. The reversal of 3689181 is 1819863.

It can be written as a sum of positive squares in only one way, i.e., 3404025 + 285156 = 1845^2 + 534^2 .

It is not a de Polignac number, because 3689181 - 2⁵ = 3689149 is a prime.

It is a super-2 number, since 2×3689181² = 27220112901522, 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 (3689183) 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, 204946 + ... + 204963.

Almost surely, 2^3689181 is an apocalyptic number.

It is an amenable number.

3689181 is a deficient number, since it is larger than the sum of its proper divisors (1639649).

3689181 is a wasteful number, since it uses less digits than its factorization.

3689181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409915 (or 409912 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 3689181 is about 1920.7240822148. The cubic root of 3689181 is about 154.5171376346.

The spelling of 3689181 in words is "three million, six hundred eighty-nine thousand, one hundred eighty-one".