523442221 has 4 divisors (see below), whose sum is σ = 523492992. Its totient is φ = 523391452.

The previous prime is 523442137. The next prime is 523442233. The reversal of 523442221 is 122244325.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 523442221 - 2⁷ = 523442093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523442921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3805 + ... + 32578.

It is an arithmetic number, because the mean of its divisors is an integer number (130873248).

Almost surely, 2^523442221 is an apocalyptic number.

It is an amenable number.

523442221 is a deficient number, since it is larger than the sum of its proper divisors (50771).

523442221 is a wasteful number, since it uses less digits than its factorization.

523442221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50770.

The product of its digits is 3840, while the sum is 25.

The square root of 523442221 is about 22878.8596962349. The cubic root of 523442221 is about 805.9156388050.

Adding to 523442221 its reverse (122244325), we get a palindrome (645686546).

The spelling of 523442221 in words is "five hundred twenty-three million, four hundred forty-two thousand, two hundred twenty-one".