2161853 has 2 divisors, whose sum is σ = 2161854. Its totient is φ = 2161852.

The previous prime is 2161849. The next prime is 2161871. The reversal of 2161853 is 3581612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1965604 + 196249 = 1402^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161853 - 2² = 2161849 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 (2161813) 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, 1080926 + 1080927.

It is an arithmetic number, because the mean of its divisors is an integer number (1080927).

2^2161853 is an apocalyptic number.

It is an amenable number.

2161853 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161853 is an equidigital number, since it uses as much as digits as its factorization.

2161853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 2161853 is about 1470.3241139286. The cubic root of 2161853 is about 129.3030353504.

The spelling of 2161853 in words is "two million, one hundred sixty-one thousand, eight hundred fifty-three".