2189210409 has 10 divisors (see below), whose sum is σ = 3270302090. Its totient is φ = 1459473552.

The previous prime is 2189210393. The next prime is 2189210447. The reversal of 2189210409 is 9040129812.

It can be written as a sum of positive squares in only one way, i.e., 1795386384 + 393824025 = 42372^2 + 19845^2 .

It is not a de Polignac number, because 2189210409 - 2⁴ = 2189210393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2189210809) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13513564 + ... + 13513725.

It is an arithmetic number, because the mean of its divisors is an integer number (327030209).

Almost surely, 2^2189210409 is an apocalyptic number.

It is an amenable number.

2189210409 is a deficient number, since it is larger than the sum of its proper divisors (1081091681).

2189210409 is an equidigital number, since it uses as much as digits as its factorization.

2189210409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27027301 (or 27027292 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 2189210409 is about 46788.9988031375. The cubic root of 2189210409 is about 1298.4617721251.

The spelling of 2189210409 in words is "two billion, one hundred eighty-nine million, two hundred ten thousand, four hundred nine".