309059937218 has 6 divisors (see below), whose sum is σ = 463591085139. Its totient is φ = 154529575506.

The previous prime is 309059937217. The next prime is 309059937233. The reversal of 309059937218 is 812739950903.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 154529968609 + 154529968609 = 393103^2 + 393103^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=393103.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309059937217) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 589655 + ... + 982757.

Almost surely, 2^309059937218 is an apocalyptic number.

309059937218 is a deficient number, since it is larger than the sum of its proper divisors (154531147921).

309059937218 is an frugal number, since it uses more digits than its factorization.

309059937218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786208 (or 393105 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 56.

The spelling of 309059937218 in words is "three hundred nine billion, fifty-nine million, nine hundred thirty-seven thousand, two hundred eighteen".