803521 has 4 divisors (see below), whose sum is σ = 817200. Its totient is φ = 789844.

The previous prime is 803519. The next prime is 803549. The reversal of 803521 is 125308.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 803521 - 2¹ = 803519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (803501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6751 + ... + 6868.

It is an arithmetic number, because the mean of its divisors is an integer number (204300).

2⁸⁰³⁵²¹ is an apocalyptic number.

It is an amenable number.

803521 is a deficient number, since it is larger than the sum of its proper divisors (13679).

803521 is a wasteful number, since it uses less digits than its factorization.

803521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13678.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 803521 is about 896.3933288462. The cubic root of 803521 is about 92.9677693068.

Adding to 803521 its reverse (125308), we get a palindrome (928829).

The spelling of 803521 in words is "eight hundred three thousand, five hundred twenty-one".