90320840809 has 2 divisors, whose sum is σ = 90320840810. Its totient is φ = 90320840808.

The previous prime is 90320840807. The next prime is 90320840927. The reversal of 90320840809 is 90804802309.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89728405209 + 592435600 = 299547^2 + 24340^2 .

It is a cyclic number.

It is not a de Polignac number, because 90320840809 - 2¹ = 90320840807 is a prime.

Together with 90320840807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (90320840807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45160420404 + 45160420405.

It is an arithmetic number, because the mean of its divisors is an integer number (45160420405).

Almost surely, 2^90320840809 is an apocalyptic number.

It is an amenable number.

90320840809 is a deficient number, since it is larger than the sum of its proper divisors (1).

90320840809 is an equidigital number, since it uses as much as digits as its factorization.

90320840809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 90320840809 in words is "ninety billion, three hundred twenty million, eight hundred forty thousand, eight hundred nine".