90818234209 has 2 divisors, whose sum is σ = 90818234210. Its totient is φ = 90818234208.

The previous prime is 90818234119. The next prime is 90818234233. The reversal of 90818234209 is 90243281809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68489507025 + 22328727184 = 261705^2 + 149428^2 .

It is a cyclic number.

It is not a de Polignac number, because 90818234209 - 2¹³ = 90818226017 is a prime.

It is not a weakly prime, because it can be changed into another prime (90818234009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45409117104 + 45409117105.

It is an arithmetic number, because the mean of its divisors is an integer number (45409117105).

Almost surely, 2^90818234209 is an apocalyptic number.

It is an amenable number.

90818234209 is a deficient number, since it is larger than the sum of its proper divisors (1).

90818234209 is an equidigital number, since it uses as much as digits as its factorization.

90818234209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 90818234209 in words is "ninety billion, eight hundred eighteen million, two hundred thirty-four thousand, two hundred nine".