673849909 has 2 divisors, whose sum is σ = 673849910. Its totient is φ = 673849908.

The previous prime is 673849879. The next prime is 673849931. The reversal of 673849909 is 909948376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 587917009 + 85932900 = 24247^2 + 9270^2 .

It is a cyclic number.

It is not a de Polignac number, because 673849909 - 2¹³ = 673841717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 673849909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673849949) 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, 336924954 + 336924955.

It is an arithmetic number, because the mean of its divisors is an integer number (336924955).

Almost surely, 2^673849909 is an apocalyptic number.

It is an amenable number.

673849909 is a deficient number, since it is larger than the sum of its proper divisors (1).

673849909 is an equidigital number, since it uses as much as digits as its factorization.

673849909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 673849909 is about 25958.6191658956. The cubic root of 673849909 is about 876.7068328367.

The spelling of 673849909 in words is "six hundred seventy-three million, eight hundred forty-nine thousand, nine hundred nine".