385681609 has 2 divisors, whose sum is σ = 385681610. Its totient is φ = 385681608.

The previous prime is 385681579. The next prime is 385681619. The reversal of 385681609 is 906186583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229431609 + 156250000 = 15147^2 + 12500^2 .

It is an emirp because it is prime and its reverse (906186583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 385681609 - 2⁷ = 385681481 is a prime.

It is not a weakly prime, because it can be changed into another prime (385681619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192840804 + 192840805.

It is an arithmetic number, because the mean of its divisors is an integer number (192840805).

Almost surely, 2^385681609 is an apocalyptic number.

It is an amenable number.

385681609 is a deficient number, since it is larger than the sum of its proper divisors (1).

385681609 is an equidigital number, since it uses as much as digits as its factorization.

385681609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 385681609 is about 19638.7781951933. The cubic root of 385681609 is about 727.9076943155.

The spelling of 385681609 in words is "three hundred eighty-five million, six hundred eighty-one thousand, six hundred nine".