203450400809 has 2 divisors, whose sum is σ = 203450400810. Its totient is φ = 203450400808.

The previous prime is 203450400781. The next prime is 203450400817. The reversal of 203450400809 is 908004054302.

203450400809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166624790809 + 36825610000 = 408197^2 + 191900^2 .

It is a cyclic number.

It is not a de Polignac number, because 203450400809 - 2²⁰ = 203449352233 is a prime.

It is not a weakly prime, because it can be changed into another prime (203450400709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101725200404 + 101725200405.

It is an arithmetic number, because the mean of its divisors is an integer number (101725200405).

Almost surely, 2^203450400809 is an apocalyptic number.

It is an amenable number.

203450400809 is a deficient number, since it is larger than the sum of its proper divisors (1).

203450400809 is an equidigital number, since it uses as much as digits as its factorization.

203450400809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 203450400809 in words is "two hundred three billion, four hundred fifty million, four hundred thousand, eight hundred nine".