523531221 has 16 divisors (see below), whose sum is σ = 732183936. Its totient is φ = 332107776.

The previous prime is 523531189. The next prime is 523531259. The reversal of 523531221 is 122135325.

It is a happy number.

It is not a de Polignac number, because 523531221 - 2⁵ = 523531189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 523531191 and 523531200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523531291) 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, 6340 + ... + 32973.

It is an arithmetic number, because the mean of its divisors is an integer number (45761496).

Almost surely, 2^523531221 is an apocalyptic number.

It is an amenable number.

523531221 is a deficient number, since it is larger than the sum of its proper divisors (208652715).

523531221 is a wasteful number, since it uses less digits than its factorization.

523531221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39532.

The product of its digits is 1800, while the sum is 24.

The square root of 523531221 is about 22880.8046405715. The cubic root of 523531221 is about 805.9613123764.

Adding to 523531221 its reverse (122135325), we get a palindrome (645666546).

The spelling of 523531221 in words is "five hundred twenty-three million, five hundred thirty-one thousand, two hundred twenty-one".