7481809 has 2 divisors, whose sum is σ = 7481810. Its totient is φ = 7481808.

The previous prime is 7481783. The next prime is 7481857. The reversal of 7481809 is 9081847.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7139584 + 342225 = 2672^2 + 585^2 .

It is an emirp because it is prime and its reverse (9081847) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7481809 - 2⁹ = 7481297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7481879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3740904 + 3740905.

It is an arithmetic number, because the mean of its divisors is an integer number (3740905).

Almost surely, 2^7481809 is an apocalyptic number.

It is an amenable number.

7481809 is a deficient number, since it is larger than the sum of its proper divisors (1).

7481809 is an equidigital number, since it uses as much as digits as its factorization.

7481809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 7481809 is about 2735.2895641961. The cubic root of 7481809 is about 195.5849975878.

The spelling of 7481809 in words is "seven million, four hundred eighty-one thousand, eight hundred nine".