2195805817 has 2 divisors, whose sum is σ = 2195805818. Its totient is φ = 2195805816.

The previous prime is 2195805803. The next prime is 2195805823. The reversal of 2195805817 is 7185085912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2186871696 + 8934121 = 46764^2 + 2989^2 .

It is a cyclic number.

It is not a de Polignac number, because 2195805817 - 2¹¹ = 2195803769 is a prime.

It is not a weakly prime, because it can be changed into another prime (2195805827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097902908 + 1097902909.

It is an arithmetic number, because the mean of its divisors is an integer number (1097902909).

Almost surely, 2^2195805817 is an apocalyptic number.

It is an amenable number.

2195805817 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195805817 is an equidigital number, since it uses as much as digits as its factorization.

2195805817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 46.

The square root of 2195805817 is about 46859.4261275146. The cubic root of 2195805817 is about 1299.7644182580.

The spelling of 2195805817 in words is "two billion, one hundred ninety-five million, eight hundred five thousand, eight hundred seventeen".