804781509 has 16 divisors (see below), whose sum is σ = 1226841600. Its totient is φ = 459684720.

The previous prime is 804781501. The next prime is 804781519. The reversal of 804781509 is 905187408.

It is not a de Polignac number, because 804781509 - 2³ = 804781501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (804781501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55942 + ... + 68840.

It is an arithmetic number, because the mean of its divisors is an integer number (76677600).

Almost surely, 2^804781509 is an apocalyptic number.

It is an amenable number.

804781509 is a deficient number, since it is larger than the sum of its proper divisors (422060091).

804781509 is a wasteful number, since it uses less digits than its factorization.

804781509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15880.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 804781509 is about 28368.6712589786. The cubic root of 804781509 is about 930.1635774240.

The spelling of 804781509 in words is "eight hundred four million, seven hundred eighty-one thousand, five hundred nine".