521229 has 4 divisors (see below), whose sum is σ = 694976. Its totient is φ = 347484.

The previous prime is 521201. The next prime is 521231. The reversal of 521229 is 922125.

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 not a de Polignac number, because 521229 - 2⁹ = 520717 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86869 + ... + 86874.

It is an arithmetic number, because the mean of its divisors is an integer number (173744).

2⁵²¹²²⁹ is an apocalyptic number.

It is an amenable number.

521229 is a deficient number, since it is larger than the sum of its proper divisors (173747).

521229 is a wasteful number, since it uses less digits than its factorization.

521229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173746.

The product of its digits is 360, while the sum is 21.

The square root of 521229 is about 721.9619103526. The cubic root of 521229 is about 80.4778175316.

The spelling of 521229 in words is "five hundred twenty-one thousand, two hundred twenty-nine".