2185224809 has 2 divisors, whose sum is σ = 2185224810. Its totient is φ = 2185224808.

The previous prime is 2185224803. The next prime is 2185224817. The reversal of 2185224809 is 9084225812.

It is a happy number.

2185224809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1219755625 + 965469184 = 34925^2 + 31072^2 .

It is a cyclic number.

It is not a de Polignac number, because 2185224809 - 2⁴ = 2185224793 is a prime.

It is not a weakly prime, because it can be changed into another prime (2185224803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1092612404 + 1092612405.

It is an arithmetic number, because the mean of its divisors is an integer number (1092612405).

Almost surely, 2^2185224809 is an apocalyptic number.

It is an amenable number.

2185224809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2185224809 is an equidigital number, since it uses as much as digits as its factorization.

2185224809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 2185224809 is about 46746.3881920304. The cubic root of 2185224809 is about 1297.6733154037.

The spelling of 2185224809 in words is "two billion, one hundred eighty-five million, two hundred twenty-four thousand, eight hundred nine".