3643181 has 2 divisors, whose sum is σ = 3643182. Its totient is φ = 3643180.

The previous prime is 3643147. The next prime is 3643201. The reversal of 3643181 is 1813463.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2920681 + 722500 = 1709^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 3643181 - 2¹⁰ = 3642157 is a prime.

It is a super-2 number, since 2×3643181² = 26545535597522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3643181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3643141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1821590 + 1821591.

It is an arithmetic number, because the mean of its divisors is an integer number (1821591).

Almost surely, 2^3643181 is an apocalyptic number.

It is an amenable number.

3643181 is a deficient number, since it is larger than the sum of its proper divisors (1).

3643181 is an equidigital number, since it uses as much as digits as its factorization.

3643181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 3643181 is about 1908.7118692982. The cubic root of 3643181 is about 153.8722305606.

The spelling of 3643181 in words is "three million, six hundred forty-three thousand, one hundred eighty-one".