825789621 has 4 divisors (see below), whose sum is σ = 1101052832. Its totient is φ = 550526412.

The previous prime is 825789619. The next prime is 825789641. The reversal of 825789621 is 126987528.

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 825789621 - 2¹ = 825789619 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 (825789641) 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, 137631601 + ... + 137631606.

It is an arithmetic number, because the mean of its divisors is an integer number (275263208).

Almost surely, 2^825789621 is an apocalyptic number.

It is an amenable number.

825789621 is a deficient number, since it is larger than the sum of its proper divisors (275263211).

825789621 is a wasteful number, since it uses less digits than its factorization.

825789621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275263210.

The product of its digits is 483840, while the sum is 48.

The square root of 825789621 is about 28736.5554825209. Note that the first 3 decimals coincide. The cubic root of 825789621 is about 938.1878551533.

The spelling of 825789621 in words is "eight hundred twenty-five million, seven hundred eighty-nine thousand, six hundred twenty-one".