825527809 has 4 divisors (see below), whose sum is σ = 831829680. Its totient is φ = 819225940.

The previous prime is 825527783. The next prime is 825527821. The reversal of 825527809 is 908725528.

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 825527809 - 2¹⁹ = 825003521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (825527849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3150739 + ... + 3151000.

It is an arithmetic number, because the mean of its divisors is an integer number (207957420).

Almost surely, 2^825527809 is an apocalyptic number.

It is an amenable number.

825527809 is a deficient number, since it is larger than the sum of its proper divisors (6301871).

825527809 is a wasteful number, since it uses less digits than its factorization.

825527809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6301870.

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 825527809 is about 28731.9997389670. Note that the first 3 decimals coincide. The cubic root of 825527809 is about 938.0886955952.

The spelling of 825527809 in words is "eight hundred twenty-five million, five hundred twenty-seven thousand, eight hundred nine".