3640181 has 2 divisors, whose sum is σ = 3640182. Its totient is φ = 3640180.

The previous prime is 3640163. The next prime is 3640207. The reversal of 3640181 is 1810463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2669956 + 970225 = 1634^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640181 - 2¹⁰ = 3639157 is a prime.

It is a super-2 number, since 2×3640181² = 26501835425522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3640121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820090 + 1820091.

It is an arithmetic number, because the mean of its divisors is an integer number (1820091).

Almost surely, 2^3640181 is an apocalyptic number.

It is an amenable number.

3640181 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640181 is an equidigital number, since it uses as much as digits as its factorization.

3640181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 3640181 is about 1907.9258371331. The cubic root of 3640181 is about 153.8299832812.

The spelling of 3640181 in words is "three million, six hundred forty thousand, one hundred eighty-one".