9873801809 has 2 divisors, whose sum is σ = 9873801810. Its totient is φ = 9873801808.

The previous prime is 9873801793. The next prime is 9873801871. The reversal of 9873801809 is 9081083789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5197977409 + 4675824400 = 72097^2 + 68380^2 .

It is a cyclic number.

It is not a de Polignac number, because 9873801809 - 2⁴ = 9873801793 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9873803809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4936900904 + 4936900905.

It is an arithmetic number, because the mean of its divisors is an integer number (4936900905).

Almost surely, 2^9873801809 is an apocalyptic number.

It is an amenable number.

9873801809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9873801809 is an equidigital number, since it uses as much as digits as its factorization.

9873801809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 9873801809 is about 99367.0056356737. The cubic root of 9873801809 is about 2145.3334379125. Note that the first 3 decimals are identical.

The spelling of 9873801809 in words is "nine billion, eight hundred seventy-three million, eight hundred one thousand, eight hundred nine".