2020181 has 2 divisors, whose sum is σ = 2020182. Its totient is φ = 2020180.

The previous prime is 2020171. The next prime is 2020223. The reversal of 2020181 is 1810202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2002225 + 17956 = 1415^2 + 134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2020181 is a prime.

It is a super-2 number, since 2×2020181² = 8162262545522, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2020171) 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, 1010090 + 1010091.

It is an arithmetic number, because the mean of its divisors is an integer number (1010091).

2^2020181 is an apocalyptic number.

It is an amenable number.

2020181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020181 is an equidigital number, since it uses as much as digits as its factorization.

2020181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2020181 is about 1421.3307145067. The cubic root of 2020181 is about 126.4144620063.

Adding to 2020181 its reverse (1810202), we get a palindrome (3830383).

The spelling of 2020181 in words is "two million, twenty thousand, one hundred eighty-one".