830709809 has 2 divisors, whose sum is σ = 830709810. Its totient is φ = 830709808.

The previous prime is 830709799. The next prime is 830709833. The reversal of 830709809 is 908907038.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 491597584 + 339112225 = 22172^2 + 18415^2 .

It is a cyclic number.

It is not a de Polignac number, because 830709809 - 2¹² = 830705713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 830709809.

It is not a weakly prime, because it can be changed into another prime (830709109) 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, 415354904 + 415354905.

It is an arithmetic number, because the mean of its divisors is an integer number (415354905).

Almost surely, 2^830709809 is an apocalyptic number.

It is an amenable number.

830709809 is a deficient number, since it is larger than the sum of its proper divisors (1).

830709809 is an equidigital number, since it uses as much as digits as its factorization.

830709809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 830709809 is about 28822.0368641774. The cubic root of 830709809 is about 940.0474583705.

The spelling of 830709809 in words is "eight hundred thirty million, seven hundred nine thousand, eight hundred nine".