19171428549 has 32 divisors (see below), whose sum is σ = 32475684864. Its totient is φ = 9786191040.

The previous prime is 19171428539. The next prime is 19171428571. The reversal of 19171428549 is 94582417191.

It is not a de Polignac number, because 19171428549 - 2⁵ = 19171428517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19171428509) 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 31 ways as a sum of consecutive naturals, for example, 1124199 + ... + 1141124.

It is an arithmetic number, because the mean of its divisors is an integer number (1014865152).

Almost surely, 2^19171428549 is an apocalyptic number.

It is an amenable number.

19171428549 is a deficient number, since it is larger than the sum of its proper divisors (13304256315).

19171428549 is a wasteful number, since it uses less digits than its factorization.

19171428549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2265377.

The product of its digits is 725760, while the sum is 51.

The spelling of 19171428549 in words is "nineteen billion, one hundred seventy-one million, four hundred twenty-eight thousand, five hundred forty-nine".