2101181 has 2 divisors, whose sum is σ = 2101182. Its totient is φ = 2101180.

The previous prime is 2101157. The next prime is 2101189. The reversal of 2101181 is 1811012.

2101181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1865956 + 235225 = 1366^2 + 485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101181 is a prime.

It is a super-2 number, since 2×2101181² = 8829923189522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050590 + 1050591.

It is an arithmetic number, because the mean of its divisors is an integer number (1050591).

2^2101181 is an apocalyptic number.

It is an amenable number.

2101181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101181 is an equidigital number, since it uses as much as digits as its factorization.

2101181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 2101181 is about 1449.5451010576. The cubic root of 2101181 is about 128.0819177777.

Adding to 2101181 its reverse (1811012), we get a palindrome (3912193).

The spelling of 2101181 in words is "two million, one hundred one thousand, one hundred eighty-one".