19832240509 has 4 divisors (see below), whose sum is σ = 19835447004. Its totient is φ = 19829034016.

The previous prime is 19832240479. The next prime is 19832240513. The reversal of 19832240509 is 90504223891.

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 9332139609 + 10500100900 = 96603^2 + 102470^2 .

It is a cyclic number.

It is not a de Polignac number, because 19832240509 - 2³¹ = 17684756861 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 (19832240209) 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, 1593952 + ... + 1606345.

It is an arithmetic number, because the mean of its divisors is an integer number (4958861751).

Almost surely, 2^19832240509 is an apocalyptic number.

It is an amenable number.

19832240509 is a deficient number, since it is larger than the sum of its proper divisors (3206495).

19832240509 is an equidigital number, since it uses as much as digits as its factorization.

19832240509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206494.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 19832240509 in words is "nineteen billion, eight hundred thirty-two million, two hundred forty thousand, five hundred nine".