2085990409 has 2 divisors, whose sum is σ = 2085990410. Its totient is φ = 2085990408.

The previous prime is 2085990407. The next prime is 2085990427. The reversal of 2085990409 is 9040995802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1769043600 + 316946809 = 42060^2 + 17803^2 .

It is a cyclic number.

It is not a de Polignac number, because 2085990409 - 2¹ = 2085990407 is a prime.

Together with 2085990407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2085990407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1042995204 + 1042995205.

It is an arithmetic number, because the mean of its divisors is an integer number (1042995205).

Almost surely, 2^2085990409 is an apocalyptic number.

It is an amenable number.

2085990409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2085990409 is an equidigital number, since it uses as much as digits as its factorization.

2085990409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 2085990409 is about 45672.6439895918. The cubic root of 2085990409 is about 1277.7251278904.

The spelling of 2085990409 in words is "two billion, eighty-five million, nine hundred ninety thousand, four hundred nine".