8189509205 has 6 divisors (see below), whose sum is σ = 9827653878. Its totient is φ = 6551445480.

The previous prime is 8189509199. The next prime is 8189509249. The reversal of 8189509205 is 5029059818.

It can be written as a sum of positive squares in only one way, i.e., 6551607364 + 1637901841 = 80942^2 + 40471^2 .

It is not a de Polignac number, because 8189509205 - 2⁸ = 8189508949 is a prime.

It is a super-2 number, since 2×8189509205² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8189509205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 182120 + ... + 222590.

It is an arithmetic number, because the mean of its divisors is an integer number (1637942313).

Almost surely, 2^8189509205 is an apocalyptic number.

It is an amenable number.

8189509205 is a deficient number, since it is larger than the sum of its proper divisors (1638144673).

8189509205 is an frugal number, since it uses more digits than its factorization.

8189509205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80947 (or 40476 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 47.

The square root of 8189509205 is about 90495.9071173940. The cubic root of 8189509205 is about 2015.6693488966.

The spelling of 8189509205 in words is "eight billion, one hundred eighty-nine million, five hundred nine thousand, two hundred five".