768749209 has 2 divisors, whose sum is σ = 768749210. Its totient is φ = 768749208.

The previous prime is 768749167. The next prime is 768749243. The reversal of 768749209 is 902947867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 431475984 + 337273225 = 20772^2 + 18365^2 .

It is an emirp because it is prime and its reverse (902947867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 768749209 - 2⁹ = 768748697 is a prime.

It is not a weakly prime, because it can be changed into another prime (768749269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384374604 + 384374605.

It is an arithmetic number, because the mean of its divisors is an integer number (384374605).

Almost surely, 2^768749209 is an apocalyptic number.

It is an amenable number.

768749209 is a deficient number, since it is larger than the sum of its proper divisors (1).

768749209 is an equidigital number, since it uses as much as digits as its factorization.

768749209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The square root of 768749209 is about 27726.3270016063. The cubic root of 768749209 is about 916.0690855294.

The spelling of 768749209 in words is "seven hundred sixty-eight million, seven hundred forty-nine thousand, two hundred nine".