309950689 has 2 divisors, whose sum is σ = 309950690. Its totient is φ = 309950688.

The previous prime is 309950687. The next prime is 309950701. The reversal of 309950689 is 986059903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243609664 + 66341025 = 15608^2 + 8145^2 .

It is an emirp because it is prime and its reverse (986059903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 309950689 - 2¹ = 309950687 is a prime.

It is a super-2 number, since 2×309950689² = 192138859223149442, which contains 22 as substring.

Together with 309950687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (309950687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154975344 + 154975345.

It is an arithmetic number, because the mean of its divisors is an integer number (154975345).

Almost surely, 2^309950689 is an apocalyptic number.

It is an amenable number.

309950689 is a deficient number, since it is larger than the sum of its proper divisors (1).

309950689 is an equidigital number, since it uses as much as digits as its factorization.

309950689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 309950689 is about 17605.4164676670. The cubic root of 309950689 is about 676.7540581584.

The spelling of 309950689 in words is "three hundred nine million, nine hundred fifty thousand, six hundred eighty-nine".