673440109 has 2 divisors, whose sum is σ = 673440110. Its totient is φ = 673440108.

The previous prime is 673440107. The next prime is 673440113. The reversal of 673440109 is 901044376.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 668377609 + 5062500 = 25853^2 + 2250^2 .

It is a cyclic number.

It is not a de Polignac number, because 673440109 - 2¹ = 673440107 is a prime.

Together with 673440107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673440107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336720054 + 336720055.

It is an arithmetic number, because the mean of its divisors is an integer number (336720055).

Almost surely, 2^673440109 is an apocalyptic number.

It is an amenable number.

673440109 is a deficient number, since it is larger than the sum of its proper divisors (1).

673440109 is an equidigital number, since it uses as much as digits as its factorization.

673440109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 673440109 is about 25950.7246334279. The cubic root of 673440109 is about 876.5290745009.

The spelling of 673440109 in words is "six hundred seventy-three million, four hundred forty thousand, one hundred nine".