309985478219 has 2 divisors, whose sum is σ = 309985478220. Its totient is φ = 309985478218.

The previous prime is 309985478213. The next prime is 309985478321. The reversal of 309985478219 is 912874589903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 309985478219 - 2⁴ = 309985478203 is a prime.

It is a super-2 number, since 2×309985478219² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (309985478213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154992739109 + 154992739110.

It is an arithmetic number, because the mean of its divisors is an integer number (154992739110).

Almost surely, 2^309985478219 is an apocalyptic number.

309985478219 is a deficient number, since it is larger than the sum of its proper divisors (1).

309985478219 is an equidigital number, since it uses as much as digits as its factorization.

309985478219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39191040, while the sum is 65.

The spelling of 309985478219 in words is "three hundred nine billion, nine hundred eighty-five million, four hundred seventy-eight thousand, two hundred nineteen".