673245409 has 2 divisors, whose sum is σ = 673245410. Its totient is φ = 673245408.

The previous prime is 673245361. The next prime is 673245421. The reversal of 673245409 is 904542376.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 590490000 + 82755409 = 24300^2 + 9097^2 .

It is a cyclic number.

It is not a de Polignac number, because 673245409 - 2¹⁹ = 672721121 is a prime.

It is not a weakly prime, because it can be changed into another prime (673245439) 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, 336622704 + 336622705.

It is an arithmetic number, because the mean of its divisors is an integer number (336622705).

Almost surely, 2^673245409 is an apocalyptic number.

It is an amenable number.

673245409 is a deficient number, since it is larger than the sum of its proper divisors (1).

673245409 is an equidigital number, since it uses as much as digits as its factorization.

673245409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 673245409 is about 25946.9730219153. The cubic root of 673245409 is about 876.4445945014. Note that the first 3 decimals are identical.

The spelling of 673245409 in words is "six hundred seventy-three million, two hundred forty-five thousand, four hundred nine".