6431309 has 2 divisors, whose sum is σ = 6431310. Its totient is φ = 6431308.

The previous prime is 6431297. The next prime is 6431323. The reversal of 6431309 is 9031346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3880900 + 2550409 = 1970^2 + 1597^2 .

It is a cyclic number.

It is not a de Polignac number, because 6431309 - 2¹⁶ = 6365773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6430309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3215654 + 3215655.

It is an arithmetic number, because the mean of its divisors is an integer number (3215655).

Almost surely, 2^6431309 is an apocalyptic number.

It is an amenable number.

6431309 is a deficient number, since it is larger than the sum of its proper divisors (1).

6431309 is an equidigital number, since it uses as much as digits as its factorization.

6431309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 6431309 is about 2536.0025630902. The cubic root of 6431309 is about 185.9658182842.

The spelling of 6431309 in words is "six million, four hundred thirty-one thousand, three hundred nine".