854521 has 4 divisors (see below), whose sum is σ = 857844. Its totient is φ = 851200.

The previous prime is 854479. The next prime is 854527. The reversal of 854521 is 125458.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 739600 + 114921 = 860^2 + 339^2 .

It is a cyclic number.

It is not a de Polignac number, because 854521 - 2¹⁵ = 821753 is a prime.

It is a super-2 number, since 2×854521² = 1460412278882, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

854521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (854527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (214461).

2⁸⁵⁴⁵²¹ is an apocalyptic number.

It is an amenable number.

854521 is a deficient number, since it is larger than the sum of its proper divisors (3323).

854521 is a wasteful number, since it uses less digits than its factorization.

854521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322.

The product of its digits is 1600, while the sum is 25.

The square root of 854521 is about 924.4030506224. The cubic root of 854521 is about 94.8944719249.

Adding to 854521 its reverse (125458), we get a palindrome (979979).

The spelling of 854521 in words is "eight hundred fifty-four thousand, five hundred twenty-one".