842309609 has 2 divisors, whose sum is σ = 842309610. Its totient is φ = 842309608.

The previous prime is 842309603. The next prime is 842309621. The reversal of 842309609 is 906903248.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 831053584 + 11256025 = 28828^2 + 3355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842309609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (842309603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421154804 + 421154805.

It is an arithmetic number, because the mean of its divisors is an integer number (421154805).

Almost surely, 2^842309609 is an apocalyptic number.

It is an amenable number.

842309609 is a deficient number, since it is larger than the sum of its proper divisors (1).

842309609 is an equidigital number, since it uses as much as digits as its factorization.

842309609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 842309609 is about 29022.5706821432. The cubic root of 842309609 is about 944.4027688702.

It can be divided in two parts, 84230 and 9609, that added together give a palindrome (93839).

The spelling of 842309609 in words is "eight hundred forty-two million, three hundred nine thousand, six hundred nine".