19399147609 has 4 divisors (see below), whose sum is σ = 19765169316. Its totient is φ = 19033125904.

The previous prime is 19399147597. The next prime is 19399147613. The reversal of 19399147609 is 90674199391.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11449642009 + 7949505600 = 107003^2 + 89160^2 .

It is a cyclic number.

It is not a de Polignac number, because 19399147609 - 2²¹ = 19397050457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19399147699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183010774 + ... + 183010879.

It is an arithmetic number, because the mean of its divisors is an integer number (4941292329).

Almost surely, 2^19399147609 is an apocalyptic number.

It is an amenable number.

19399147609 is a deficient number, since it is larger than the sum of its proper divisors (366021707).

19399147609 is an equidigital number, since it uses as much as digits as its factorization.

19399147609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366021706.

The product of its (nonzero) digits is 3306744, while the sum is 58.

The spelling of 19399147609 in words is "nineteen billion, three hundred ninety-nine million, one hundred forty-seven thousand, six hundred nine".