4018181 has 2 divisors, whose sum is σ = 4018182. Its totient is φ = 4018180.

The previous prime is 4018159. The next prime is 4018207. The reversal of 4018181 is 1818104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3960100 + 58081 = 1990^2 + 241^2 .

It is a cyclic number.

It is not a de Polignac number, because 4018181 - 2¹⁸ = 3756037 is a prime.

It is a super-2 number, since 2×4018181² = 32291557097522, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4018151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2009090 + 2009091.

It is an arithmetic number, because the mean of its divisors is an integer number (2009091).

Almost surely, 2^4018181 is an apocalyptic number.

It is an amenable number.

4018181 is a deficient number, since it is larger than the sum of its proper divisors (1).

4018181 is an equidigital number, since it uses as much as digits as its factorization.

4018181 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 23.

The square root of 4018181 is about 2004.5400968801. The cubic root of 4018181 is about 158.9802462175.

The spelling of 4018181 in words is "four million, eighteen thousand, one hundred eighty-one".