7928049209 has 2 divisors, whose sum is σ = 7928049210. Its totient is φ = 7928049208.

The previous prime is 7928049197. The next prime is 7928049211. The reversal of 7928049209 is 9029408297.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4276506025 + 3651543184 = 65395^2 + 60428^2 .

It is a cyclic number.

It is not a de Polignac number, because 7928049209 - 2¹² = 7928045113 is a prime.

Together with 7928049211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7928049509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3964024604 + 3964024605.

It is an arithmetic number, because the mean of its divisors is an integer number (3964024605).

Almost surely, 2^7928049209 is an apocalyptic number.

It is an amenable number.

7928049209 is a deficient number, since it is larger than the sum of its proper divisors (1).

7928049209 is an equidigital number, since it uses as much as digits as its factorization.

7928049209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 7928049209 is about 89039.5934907612. The cubic root of 7928049209 is about 1993.9860349884.

The spelling of 7928049209 in words is "seven billion, nine hundred twenty-eight million, forty-nine thousand, two hundred nine".