2019558209 has 4 divisors (see below), whose sum is σ = 2084705280. Its totient is φ = 1954411140.

The previous prime is 2019558193. The next prime is 2019558251. The reversal of 2019558209 is 9028559102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2019558209 - 2⁴ = 2019558193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2019258209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32573489 + ... + 32573550.

It is an arithmetic number, because the mean of its divisors is an integer number (521176320).

Almost surely, 2^2019558209 is an apocalyptic number.

It is an amenable number.

2019558209 is a deficient number, since it is larger than the sum of its proper divisors (65147071).

2019558209 is an equidigital number, since it uses as much as digits as its factorization.

2019558209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65147070.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 2019558209 is about 44939.4949793609. The cubic root of 2019558209 is about 1264.0147012073.

The spelling of 2019558209 in words is "two billion, nineteen million, five hundred fifty-eight thousand, two hundred nine".