308639135809 has 9 divisors (see below), whose sum is σ = 319665541897. Its totient is φ = 297980851504.

The previous prime is 308639135807. The next prime is 308639135869. The reversal of 308639135809 is 908531936803.

It is a happy number.

The square root of 308639135809 is 555553.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 94706985025 + 213932150784 = 307745^2 + 462528^2 .

It is not a de Polignac number, because 308639135809 - 2¹ = 308639135807 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 308639135809.

It is not an unprimeable number, because it can be changed into a prime (308639135801) 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 8 ways as a sum of consecutive naturals, for example, 16101459 + ... + 16120615.

Almost surely, 2^308639135809 is an apocalyptic number.

308639135809 is the 555553-rd square number.

308639135809 is the 277777-th centered octagonal number.

It is an amenable number.

308639135809 is a deficient number, since it is larger than the sum of its proper divisors (11026406088).

308639135809 is an frugal number, since it uses more digits than its factorization.

308639135809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38372 (or 19186 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 308639135809 in words is "three hundred eight billion, six hundred thirty-nine million, one hundred thirty-five thousand, eight hundred nine".