9090471809 has 2 divisors, whose sum is σ = 9090471810. Its totient is φ = 9090471808.

The previous prime is 9090471749. The next prime is 9090471811. The reversal of 9090471809 is 9081740909.

9090471809 is digitally balanced in base 2 and base 3, because in such bases 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., 8922691600 + 167780209 = 94460^2 + 12953^2 .

It is a cyclic number.

It is not a de Polignac number, because 9090471809 - 2⁸ = 9090471553 is a prime.

Together with 9090471811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9090471409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4545235904 + 4545235905.

It is an arithmetic number, because the mean of its divisors is an integer number (4545235905).

Almost surely, 2^9090471809 is an apocalyptic number.

It is an amenable number.

9090471809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9090471809 is an equidigital number, since it uses as much as digits as its factorization.

9090471809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 9090471809 is about 95343.9657713062. The cubic root of 9090471809 is about 2087.0305585909.

The spelling of 9090471809 in words is "nine billion, ninety million, four hundred seventy-one thousand, eight hundred nine".