522031221 has 6 divisors (see below), whose sum is σ = 754045110. Its totient is φ = 348020808.

The previous prime is 522031183. The next prime is 522031231. The reversal of 522031221 is 122130225.

It can be written as a sum of positive squares in only one way, i.e., 513702225 + 8328996 = 22665^2 + 2886^2 .

It is not a de Polignac number, because 522031221 - 2⁶ = 522031157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 522031194 and 522031203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (522031231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29001726 + ... + 29001743.

It is an arithmetic number, because the mean of its divisors is an integer number (125674185).

Almost surely, 2^522031221 is an apocalyptic number.

It is an amenable number.

522031221 is a deficient number, since it is larger than the sum of its proper divisors (232013889).

522031221 is a wasteful number, since it uses less digits than its factorization.

522031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58003475 (or 58003472 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 522031221 is about 22848.0025603990. The cubic root of 522031221 is about 805.1908403938.

Adding to 522031221 its reverse (122130225), we get a palindrome (644161446).

The spelling of 522031221 in words is "five hundred twenty-two million, thirty-one thousand, two hundred twenty-one".