789521 has 4 divisors (see below), whose sum is σ = 823872. Its totient is φ = 755172.

The previous prime is 789511. The next prime is 789527. The reversal of 789521 is 125987.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125987 = 17 ⋅7411.

It is a cyclic number.

It is not a de Polignac number, because 789521 - 2¹⁰ = 788497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (789527) 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, 17141 + ... + 17186.

It is an arithmetic number, because the mean of its divisors is an integer number (205968).

2⁷⁸⁹⁵²¹ is an apocalyptic number.

It is an amenable number.

789521 is a deficient number, since it is larger than the sum of its proper divisors (34351).

789521 is a wasteful number, since it uses less digits than its factorization.

789521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34350.

The product of its digits is 5040, while the sum is 32.

The square root of 789521 is about 888.5499423218. The cubic root of 789521 is about 92.4246671772.

The spelling of 789521 in words is "seven hundred eighty-nine thousand, five hundred twenty-one".