538708187209 has 4 divisors (see below), whose sum is σ = 539533162116. Its totient is φ = 537883212304.

The previous prime is 538708187159. The next prime is 538708187243. The reversal of 538708187209 is 902781807835.

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 133484276025 + 405223911184 = 365355^2 + 636572^2 .

It is a cyclic number.

It is not a de Polignac number, because 538708187209 - 2⁹ = 538708186697 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538708167209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412486474 + ... + 412487779.

It is an arithmetic number, because the mean of its divisors is an integer number (134883290529).

Almost surely, 2^538708187209 is an apocalyptic number.

It is an amenable number.

538708187209 is a deficient number, since it is larger than the sum of its proper divisors (824974907).

538708187209 is an equidigital number, since it uses as much as digits as its factorization.

538708187209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824974906.

The product of its (nonzero) digits is 6773760, while the sum is 58.

The spelling of 538708187209 in words is "five hundred thirty-eight billion, seven hundred eight million, one hundred eighty-seven thousand, two hundred nine".