19503828109 has 4 divisors (see below), whose sum is σ = 19696935420. Its totient is φ = 19310720800.

The previous prime is 19503828089. The next prime is 19503828131. The reversal of 19503828109 is 90182830591.

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 17739576100 + 1764252009 = 133190^2 + 42003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19503828109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19503828209) 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, 96553504 + ... + 96553705.

It is an arithmetic number, because the mean of its divisors is an integer number (4924233855).

Almost surely, 2^19503828109 is an apocalyptic number.

It is an amenable number.

19503828109 is a deficient number, since it is larger than the sum of its proper divisors (193107311).

19503828109 is a wasteful number, since it uses less digits than its factorization.

19503828109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193107310.

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 19503828109 in words is "nineteen billion, five hundred three million, eight hundred twenty-eight thousand, one hundred nine".