19209841409 has 4 divisors (see below), whose sum is σ = 20956190640. Its totient is φ = 17463492180.

The previous prime is 19209841379. The next prime is 19209841421. The reversal of 19209841409 is 90414890291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19209841409 - 2¹⁶ = 19209775873 is a prime.

It is a super-2 number, since 2×19209841409² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19209841429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 873174599 + ... + 873174620.

It is an arithmetic number, because the mean of its divisors is an integer number (5239047660).

Almost surely, 2^19209841409 is an apocalyptic number.

It is an amenable number.

19209841409 is a deficient number, since it is larger than the sum of its proper divisors (1746349231).

19209841409 is a wasteful number, since it uses less digits than its factorization.

19209841409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746349230.

The product of its (nonzero) digits is 186624, while the sum is 47.

The spelling of 19209841409 in words is "nineteen billion, two hundred nine million, eight hundred forty-one thousand, four hundred nine".