805311909 has 16 divisors (see below), whose sum is σ = 1200205440. Its totient is φ = 533656800.

The previous prime is 805311823. The next prime is 805311911. The reversal of 805311909 is 909113508.

It is a happy number.

It is not a de Polignac number, because 805311909 - 2⁸ = 805311653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805311509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84792 + ... + 93809.

It is an arithmetic number, because the mean of its divisors is an integer number (75012840).

Almost surely, 2^805311909 is an apocalyptic number.

It is an amenable number.

805311909 is a deficient number, since it is larger than the sum of its proper divisors (394893531).

805311909 is a wasteful number, since it uses less digits than its factorization.

805311909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178777 (or 178771 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 805311909 is about 28378.0180597589. The cubic root of 805311909 is about 930.3678773535.

The spelling of 805311909 in words is "eight hundred five million, three hundred eleven thousand, nine hundred nine".