8139264209 has 4 divisors (see below), whose sum is σ = 8139473316. Its totient is φ = 8139055104.

The previous prime is 8139264191. The next prime is 8139264257. The reversal of 8139264209 is 9024629318.

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 4088323600 + 4050940609 = 63940^2 + 63647^2 .

It is a cyclic number.

It is not a de Polignac number, because 8139264209 - 2¹² = 8139260113 is a prime.

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 8139264209.

It is not an unprimeable number, because it can be changed into a prime (8139264409) 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, 26984 + ... + 130409.

It is an arithmetic number, because the mean of its divisors is an integer number (2034868329).

Almost surely, 2^8139264209 is an apocalyptic number.

It is an amenable number.

8139264209 is a deficient number, since it is larger than the sum of its proper divisors (209107).

8139264209 is a wasteful number, since it uses less digits than its factorization.

8139264209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209106.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 8139264209 is about 90217.8707851166. The cubic root of 8139264209 is about 2011.5386524777.

The spelling of 8139264209 in words is "eight billion, one hundred thirty-nine million, two hundred sixty-four thousand, two hundred nine".