802865909 has 2 divisors, whose sum is σ = 802865910. Its totient is φ = 802865908.

The previous prime is 802865897. The next prime is 802865929. The reversal of 802865909 is 909568208.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 797893009 + 4972900 = 28247^2 + 2230^2 .

It is a cyclic number.

It is not a de Polignac number, because 802865909 - 2⁴ = 802865893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (802865929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401432954 + 401432955.

It is an arithmetic number, because the mean of its divisors is an integer number (401432955).

Almost surely, 2^802865909 is an apocalyptic number.

It is an amenable number.

802865909 is a deficient number, since it is larger than the sum of its proper divisors (1).

802865909 is an equidigital number, since it uses as much as digits as its factorization.

802865909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 802865909 is about 28334.8885475133. Note that the first 3 decimals coincide. The cubic root of 802865909 is about 929.4249765565.

It can be divided in two parts, 8028 and 65909, that added together give a palindrome (73937).

The spelling of 802865909 in words is "eight hundred two million, eight hundred sixty-five thousand, nine hundred nine".