423011209 has 2 divisors, whose sum is σ = 423011210. Its totient is φ = 423011208.

The previous prime is 423011207. The next prime is 423011257. The reversal of 423011209 is 902110324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400000000 + 23011209 = 20000^2 + 4797^2 .

It is a cyclic number.

It is not a de Polignac number, because 423011209 - 2¹ = 423011207 is a prime.

Together with 423011207, 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 423011209.

It is not a weakly prime, because it can be changed into another prime (423011207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211505604 + 211505605.

It is an arithmetic number, because the mean of its divisors is an integer number (211505605).

Almost surely, 2^423011209 is an apocalyptic number.

It is an amenable number.

423011209 is a deficient number, since it is larger than the sum of its proper divisors (1).

423011209 is an equidigital number, since it uses as much as digits as its factorization.

423011209 is an evil number, because the sum of its binary digits is even.

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

The square root of 423011209 is about 20567.2362995129. The cubic root of 423011209 is about 750.6727054798.

It can be divided in two parts, 4 and 23011209, that multiplied together give a square (92044836 = 9594²).

The spelling of 423011209 in words is "four hundred twenty-three million, eleven thousand, two hundred nine".