609709 has 2 divisors, whose sum is σ = 609710. Its totient is φ = 609708.

The previous prime is 609701. The next prime is 609743. The reversal of 609709 is 907906.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334084 + 275625 = 578^2 + 525^2 .

It is a cyclic number.

It is not a de Polignac number, because 609709 - 2³ = 609701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (609701) 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, 304854 + 304855.

It is an arithmetic number, because the mean of its divisors is an integer number (304855).

2⁶⁰⁹⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

609709 is a deficient number, since it is larger than the sum of its proper divisors (1).

609709 is an equidigital number, since it uses as much as digits as its factorization.

609709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 609709 is about 780.8386517073. The cubic root of 609709 is about 84.7957726770.

The spelling of 609709 in words is "six hundred nine thousand, seven hundred nine".