2023121209 has 2 divisors, whose sum is σ = 2023121210. Its totient is φ = 2023121208.

The previous prime is 2023121207. The next prime is 2023121237. The reversal of 2023121209 is 9021213202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1877315584 + 145805625 = 43328^2 + 12075^2 .

It is a cyclic number.

It is not a de Polignac number, because 2023121209 - 2¹ = 2023121207 is a prime.

Together with 2023121207, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2023121209.

It is not a weakly prime, because it can be changed into another prime (2023121201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1011560604 + 1011560605.

It is an arithmetic number, because the mean of its divisors is an integer number (1011560605).

Almost surely, 2^2023121209 is an apocalyptic number.

It is an amenable number.

2023121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2023121209 is an equidigital number, since it uses as much as digits as its factorization.

2023121209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2023121209 is about 44979.1197001453. The cubic root of 2023121209 is about 1264.7576093040.

The spelling of 2023121209 in words is "two billion, twenty-three million, one hundred twenty-one thousand, two hundred nine".