825084991 has 4 divisors (see below), whose sum is σ = 825884752. Its totient is φ = 824285232.

The previous prime is 825084977. The next prime is 825085031. The reversal of 825084991 is 199480528.

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

It is a cyclic number.

It is not a de Polignac number, because 825084991 - 2⁵ = 825084959 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 (825084901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398331 + ... + 400396.

It is an arithmetic number, because the mean of its divisors is an integer number (206471188).

Almost surely, 2^825084991 is an apocalyptic number.

825084991 is a deficient number, since it is larger than the sum of its proper divisors (799761).

825084991 is a wasteful number, since it uses less digits than its factorization.

825084991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799760.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 825084991 is about 28724.2926979935. The cubic root of 825084991 is about 937.9209334870.

The spelling of 825084991 in words is "eight hundred twenty-five million, eighty-four thousand, nine hundred ninety-one".