806824509 has 4 divisors (see below), whose sum is σ = 1075766016. Its totient is φ = 537883004.

The previous prime is 806824451. The next prime is 806824547. The reversal of 806824509 is 905428608.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 806824509 - 2⁸ = 806824253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806824589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134470749 + ... + 134470754.

It is an arithmetic number, because the mean of its divisors is an integer number (268941504).

Almost surely, 2^806824509 is an apocalyptic number.

It is an amenable number.

806824509 is a deficient number, since it is larger than the sum of its proper divisors (268941507).

806824509 is a wasteful number, since it uses less digits than its factorization.

806824509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268941506.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 806824509 is about 28404.6564668542. The cubic root of 806824509 is about 930.9500096798.

The spelling of 806824509 in words is "eight hundred six million, eight hundred twenty-four thousand, five hundred nine".