90203430209 has 2 divisors, whose sum is σ = 90203430210. Its totient is φ = 90203430208.

The previous prime is 90203430179. The next prime is 90203430211.

90203430209 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74503340209 + 15700090000 = 272953^2 + 125300^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 90203430209 - 2¹⁶ = 90203364673 is a prime.

It is a Sophie Germain prime.

Together with 90203430211, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (90203430269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45101715104 + 45101715105.

It is an arithmetic number, because the mean of its divisors is an integer number (45101715105).

Almost surely, 2^90203430209 is an apocalyptic number.

It is an amenable number.

90203430209 is a deficient number, since it is larger than the sum of its proper divisors (1).

90203430209 is an equidigital number, since it uses as much as digits as its factorization.

90203430209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The spelling of 90203430209 in words is "ninety billion, two hundred three million, four hundred thirty thousand, two hundred nine".