4008181 has 2 divisors, whose sum is σ = 4008182. Its totient is φ = 4008180.

The previous prime is 4008161. The next prime is 4008203. The reversal of 4008181 is 1818004.

It is an a-pointer prime, because the next prime (4008203) can be obtained adding 4008181 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3964081 + 44100 = 1991^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 4008181 - 2⁵ = 4008149 is a prime.

It is a super-2 number, since 2×4008181² = 32131029857522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4008131) 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 as a sum of consecutive naturals, namely, 2004090 + 2004091.

It is an arithmetic number, because the mean of its divisors is an integer number (2004091).

Almost surely, 2^4008181 is an apocalyptic number.

It is an amenable number.

4008181 is a deficient number, since it is larger than the sum of its proper divisors (1).

4008181 is an equidigital number, since it uses as much as digits as its factorization.

4008181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 4008181 is about 2002.0442053062. The cubic root of 4008181 is about 158.8482525675.

The spelling of 4008181 in words is "four million, eight thousand, one hundred eighty-one".