2105549 has 2 divisors, whose sum is σ = 2105550. Its totient is φ = 2105548.

The previous prime is 2105513. The next prime is 2105557. The reversal of 2105549 is 9455012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1249924 + 855625 = 1118^2 + 925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052774 + 1052775.

It is an arithmetic number, because the mean of its divisors is an integer number (1052775).

2^2105549 is an apocalyptic number.

It is an amenable number.

2105549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105549 is an equidigital number, since it uses as much as digits as its factorization.

2105549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 2105549 is about 1451.0509984146. The cubic root of 2105549 is about 128.1706098971.

The spelling of 2105549 in words is "two million, one hundred five thousand, five hundred forty-nine".