19172478289 has 8 divisors (see below), whose sum is σ = 19978373160. Its totient is φ = 18376235136.

The previous prime is 19172478287. The next prime is 19172478301. The reversal of 19172478289 is 98287427191.

It can be written as a sum of positive squares in 4 ways, for example, as 388405264 + 18784073025 = 19708^2 + 137055^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19172478289 - 2¹ = 19172478287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19172478287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2408874 + ... + 2416819.

It is an arithmetic number, because the mean of its divisors is an integer number (2497296645).

Almost surely, 2^19172478289 is an apocalyptic number.

It is an amenable number.

19172478289 is a deficient number, since it is larger than the sum of its proper divisors (805894871).

19172478289 is a wasteful number, since it uses less digits than its factorization.

19172478289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4825859.

The product of its digits is 4064256, while the sum is 58.

The spelling of 19172478289 in words is "nineteen billion, one hundred seventy-two million, four hundred seventy-eight thousand, two hundred eighty-nine".