2101817 has 2 divisors, whose sum is σ = 2101818. Its totient is φ = 2101816.

The previous prime is 2101811. The next prime is 2101823. The reversal of 2101817 is 7181012.

It is a balanced prime because it is at equal distance from previous prime (2101811) and next prime (2101823).

It can be written as a sum of positive squares in only one way, i.e., 1201216 + 900601 = 1096^2 + 949^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101817 - 2¹⁰ = 2100793 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2101811) 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, 1050908 + 1050909.

It is an arithmetic number, because the mean of its divisors is an integer number (1050909).

2^2101817 is an apocalyptic number.

It is an amenable number.

2101817 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101817 is an equidigital number, since it uses as much as digits as its factorization.

2101817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 2101817 is about 1449.7644636285. The cubic root of 2101817 is about 128.0948393810.

Adding to 2101817 its reverse (7181012), we get a palindrome (9282829).

The spelling of 2101817 in words is "two million, one hundred one thousand, eight hundred seventeen".