873521 has 4 divisors (see below), whose sum is σ = 952944. Its totient is φ = 794100.

The previous prime is 873497. The next prime is 873527. The reversal of 873521 is 125378.

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 873521 - 2¹⁴ = 857137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (873527) 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, 39695 + ... + 39716.

It is an arithmetic number, because the mean of its divisors is an integer number (238236).

2⁸⁷³⁵²¹ is an apocalyptic number.

It is an amenable number.

873521 is a deficient number, since it is larger than the sum of its proper divisors (79423).

873521 is a wasteful number, since it uses less digits than its factorization.

873521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79422.

The product of its digits is 1680, while the sum is 26.

The square root of 873521 is about 934.6234535897. The cubic root of 873521 is about 95.5926387427.

Adding to 873521 its reverse (125378), we get a palindrome (998899).

The spelling of 873521 in words is "eight hundred seventy-three thousand, five hundred twenty-one".