19875289909 has 2 divisors, whose sum is σ = 19875289910. Its totient is φ = 19875289908.

The previous prime is 19875289901. The next prime is 19875289921. The reversal of 19875289909 is 90998257891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15175776100 + 4699513809 = 123190^2 + 68553^2 .

It is an emirp because it is prime and its reverse (90998257891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19875289909 - 2³ = 19875289901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19875289901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9937644954 + 9937644955.

It is an arithmetic number, because the mean of its divisors is an integer number (9937644955).

Almost surely, 2^19875289909 is an apocalyptic number.

It is an amenable number.

19875289909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19875289909 is an equidigital number, since it uses as much as digits as its factorization.

19875289909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29393280, while the sum is 67.

The spelling of 19875289909 in words is "nineteen billion, eight hundred seventy-five million, two hundred eighty-nine thousand, nine hundred nine".