850521 has 16 divisors (see below), whose sum is σ = 1312128. Its totient is φ = 480000.

The previous prime is 850481. The next prime is 850529. The reversal of 850521 is 125058.

It is not a de Polignac number, because 850521 - 2⁶ = 850457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (850529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1921 + ... + 2321.

It is an arithmetic number, because the mean of its divisors is an integer number (82008).

2⁸⁵⁰⁵²¹ is an apocalyptic number.

It is an amenable number.

850521 is a deficient number, since it is larger than the sum of its proper divisors (461607).

850521 is a wasteful number, since it uses less digits than its factorization.

850521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 850521 is about 922.2369543669. The cubic root of 850521 is about 94.7461737559.

Adding to 850521 its reverse (125058), we get a palindrome (975579).

The spelling of 850521 in words is "eight hundred fifty thousand, five hundred twenty-one".