4639020209 has 2 divisors, whose sum is σ = 4639020210. Its totient is φ = 4639020208.

The previous prime is 4639020149. The next prime is 4639020251. The reversal of 4639020209 is 9020209364.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3612010000 + 1027010209 = 60100^2 + 32047^2 .

It is a cyclic number.

It is not a de Polignac number, because 4639020209 - 2⁸ = 4639019953 is a prime.

It is not a weakly prime, because it can be changed into another prime (4639022209) 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, 2319510104 + 2319510105.

It is an arithmetic number, because the mean of its divisors is an integer number (2319510105).

Almost surely, 2^4639020209 is an apocalyptic number.

It is an amenable number.

4639020209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4639020209 is an equidigital number, since it uses as much as digits as its factorization.

4639020209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 4639020209 is about 68110.3531704248. The cubic root of 4639020209 is about 1667.7927751476.

The spelling of 4639020209 in words is "four billion, six hundred thirty-nine million, twenty thousand, two hundred nine".