825820897 has 4 divisors (see below), whose sum is σ = 900895536. Its totient is φ = 750746260.

The previous prime is 825820889. The next prime is 825820903. The reversal of 825820897 is 798028528.

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 not a de Polignac number, because 825820897 - 2³ = 825820889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 825820897.

It is not an unprimeable number, because it can be changed into a prime (825820847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37537303 + ... + 37537324.

It is an arithmetic number, because the mean of its divisors is an integer number (225223884).

Almost surely, 2^825820897 is an apocalyptic number.

It is an amenable number.

825820897 is a deficient number, since it is larger than the sum of its proper divisors (75074639).

825820897 is a wasteful number, since it uses less digits than its factorization.

825820897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75074638.

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 825820897 is about 28737.0996622832. The cubic root of 825820897 is about 938.1996993294.

The spelling of 825820897 in words is "eight hundred twenty-five million, eight hundred twenty thousand, eight hundred ninety-seven".