613609 has 2 divisors, whose sum is σ = 613610. Its totient is φ = 613608.

The previous prime is 613607. The next prime is 613633. The reversal of 613609 is 906316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 363609 + 250000 = 603^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 613609 - 2¹ = 613607 is a prime.

Together with 613607, it forms a pair of twin primes.

613609 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (613607) 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, 306804 + 306805.

It is an arithmetic number, because the mean of its divisors is an integer number (306805).

2⁶¹³⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

613609 is a deficient number, since it is larger than the sum of its proper divisors (1).

613609 is an equidigital number, since it uses as much as digits as its factorization.

613609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 613609 is about 783.3319858144. The cubic root of 613609 is about 84.9761871010.

The spelling of 613609 in words is "six hundred thirteen thousand, six hundred nine".