853521 has 4 divisors (see below), whose sum is σ = 1138032. Its totient is φ = 569012.

The previous prime is 853493. The next prime is 853529. The reversal of 853521 is 125358.

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 853521 - 2¹⁵ = 820753 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 853491 and 853500.

It is not an unprimeable number, because it can be changed into a prime (853529) 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, 142251 + ... + 142256.

It is an arithmetic number, because the mean of its divisors is an integer number (284508).

2⁸⁵³⁵²¹ is an apocalyptic number.

It is an amenable number.

853521 is a deficient number, since it is larger than the sum of its proper divisors (284511).

853521 is a wasteful number, since it uses less digits than its factorization.

853521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284510.

The product of its digits is 1200, while the sum is 24.

The square root of 853521 is about 923.8620026822. The cubic root of 853521 is about 94.8574408425.

Adding to 853521 its reverse (125358), we get a palindrome (978879).

The spelling of 853521 in words is "eight hundred fifty-three thousand, five hundred twenty-one".