19128001 has 4 divisors (see below), whose sum is σ = 19645012. Its totient is φ = 18610992.

The previous prime is 19127989. The next prime is 19128007. The reversal of 19128001 is 10082191.

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 7568001 + 11560000 = 2751^2 + 3400^2 .

It is a cyclic number.

It is not a de Polignac number, because 19128001 - 2⁹ = 19127489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19128007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258450 + ... + 258523.

It is an arithmetic number, because the mean of its divisors is an integer number (4911253).

Almost surely, 2^19128001 is an apocalyptic number.

It is an amenable number.

19128001 is a deficient number, since it is larger than the sum of its proper divisors (517011).

19128001 is an equidigital number, since it uses as much as digits as its factorization.

19128001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517010.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 19128001 is about 4373.5570191779. The cubic root of 19128001 is about 267.4380489489.

The spelling of 19128001 in words is "nineteen million, one hundred twenty-eight thousand, one".