825904813 has 4 divisors (see below), whose sum is σ = 827964828. Its totient is φ = 823844800.

The previous prime is 825904801. The next prime is 825904817. The reversal of 825904813 is 318409528.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 770506564 + 55398249 = 27758^2 + 7443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-825904813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825904817) 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, 1029406 + ... + 1030207.

It is an arithmetic number, because the mean of its divisors is an integer number (206991207).

Almost surely, 2^825904813 is an apocalyptic number.

It is an amenable number.

825904813 is a deficient number, since it is larger than the sum of its proper divisors (2060015).

825904813 is a wasteful number, since it uses less digits than its factorization.

825904813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060014.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 825904813 is about 28738.5596890310. The cubic root of 825904813 is about 938.2314767199.

The spelling of 825904813 in words is "eight hundred twenty-five million, nine hundred four thousand, eight hundred thirteen".