1922009209 has 4 divisors (see below), whose sum is σ = 1922114916. Its totient is φ = 1921903504.

The previous prime is 1922009161. The next prime is 1922009213. The reversal of 1922009209 is 9029002291.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1133803584 + 788205625 = 33672^2 + 28075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1922009209 - 2¹³ = 1922001017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1922009279) 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, 17854 + ... + 64519.

It is an arithmetic number, because the mean of its divisors is an integer number (480528729).

Almost surely, 2^1922009209 is an apocalyptic number.

It is an amenable number.

1922009209 is a deficient number, since it is larger than the sum of its proper divisors (105707).

1922009209 is an equidigital number, since it uses as much as digits as its factorization.

1922009209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105706.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 1922009209 is about 43840.7254616070. The cubic root of 1922009209 is about 1243.3263984277.

The spelling of 1922009209 in words is "one billion, nine hundred twenty-two million, nine thousand, two hundred nine".