523031221 has 4 divisors (see below), whose sum is σ = 550559200. Its totient is φ = 495503244.

The previous prime is 523031209. The next prime is 523031251. The reversal of 523031221 is 122130325.

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.

It is a cyclic number.

It is not a de Polignac number, because 523031221 - 2⁹ = 523030709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 27527959 = 523031221 / (5 + 2 + 3 + 0 + 3 + 1 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523031251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13763961 + ... + 13763998.

It is an arithmetic number, because the mean of its divisors is an integer number (137639800).

Almost surely, 2^523031221 is an apocalyptic number.

It is an amenable number.

523031221 is a deficient number, since it is larger than the sum of its proper divisors (27527979).

523031221 is a wasteful number, since it uses less digits than its factorization.

523031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27527978.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 523031221 is about 22869.8758413770. The cubic root of 523031221 is about 805.7046520937.

Adding to 523031221 its reverse (122130325), we get a palindrome (645161546).

The spelling of 523031221 in words is "five hundred twenty-three million, thirty-one thousand, two hundred twenty-one".