709609 has 2 divisors, whose sum is σ = 709610. Its totient is φ = 709608.

The previous prime is 709607. The next prime is 709649. The reversal of 709609 is 906907.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 685584 + 24025 = 828^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 709609 - 2¹ = 709607 is a prime.

Together with 709607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (709603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354804 + 354805.

It is an arithmetic number, because the mean of its divisors is an integer number (354805).

2⁷⁰⁹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

709609 is a deficient number, since it is larger than the sum of its proper divisors (1).

709609 is an equidigital number, since it uses as much as digits as its factorization.

709609 is an evil number, because the sum of its binary digits is even.

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

The square root of 709609 is about 842.3829295516. The cubic root of 709609 is about 89.1948347066.

The spelling of 709609 in words is "seven hundred nine thousand, six hundred nine".