667309 has 2 divisors, whose sum is σ = 667310. Its totient is φ = 667308.

The previous prime is 667283. The next prime is 667321. The reversal of 667309 is 903766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644809 + 22500 = 803^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 667309 - 2⁷ = 667181 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 (667379) 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, 333654 + 333655.

It is an arithmetic number, because the mean of its divisors is an integer number (333655).

2⁶⁶⁷³⁰⁹ is an apocalyptic number.

It is an amenable number.

667309 is a deficient number, since it is larger than the sum of its proper divisors (1).

667309 is an equidigital number, since it uses as much as digits as its factorization.

667309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 667309 is about 816.8898334537. The cubic root of 667309 is about 87.3860939602.

The spelling of 667309 in words is "six hundred sixty-seven thousand, three hundred nine".