616909 has 2 divisors, whose sum is σ = 616910. Its totient is φ = 616908.

The previous prime is 616897. The next prime is 616933. The reversal of 616909 is 909616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 31684 = 765^2 + 178^2 .

It is a cyclic number.

It is not a de Polignac number, because 616909 - 2⁵ = 616877 is a prime.

It is an alternating number because its digits alternate between even and odd.

616909 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616999) 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, 308454 + 308455.

It is an arithmetic number, because the mean of its divisors is an integer number (308455).

2⁶¹⁶⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

616909 is a deficient number, since it is larger than the sum of its proper divisors (1).

616909 is an equidigital number, since it uses as much as digits as its factorization.

616909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 616909 is about 785.4355479605. The cubic root of 616909 is about 85.1282493047.

The spelling of 616909 in words is "six hundred sixteen thousand, nine hundred nine".