809605220089 has 2 divisors, whose sum is σ = 809605220090. Its totient is φ = 809605220088.

The previous prime is 809605220029. The next prime is 809605220167. The reversal of 809605220089 is 980022506908.

809605220089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 553250340864 + 256354879225 = 743808^2 + 506315^2 .

It is a cyclic number.

It is not a de Polignac number, because 809605220089 - 2¹³ = 809605211897 is a prime.

It is a super-2 number, since 2×809605220089² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (809605220009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404802610044 + 404802610045.

It is an arithmetic number, because the mean of its divisors is an integer number (404802610045).

Almost surely, 2^809605220089 is an apocalyptic number.

It is an amenable number.

809605220089 is a deficient number, since it is larger than the sum of its proper divisors (1).

809605220089 is an equidigital number, since it uses as much as digits as its factorization.

809605220089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 809605220089 in words is "eight hundred nine billion, six hundred five million, two hundred twenty thousand, eighty-nine".