521329229 has 4 divisors (see below), whose sum is σ = 525942876. Its totient is φ = 516715584.

The previous prime is 521329199. The next prime is 521329243. The reversal of 521329229 is 922923125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56280004 + 465049225 = 7502^2 + 21565^2 .

It is a cyclic number.

It is not a de Polignac number, because 521329229 - 2¹⁶ = 521263693 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 (521329129) 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, 2306654 + ... + 2306879.

It is an arithmetic number, because the mean of its divisors is an integer number (131485719).

Almost surely, 2^521329229 is an apocalyptic number.

It is an amenable number.

521329229 is a deficient number, since it is larger than the sum of its proper divisors (4613647).

521329229 is a wasteful number, since it uses less digits than its factorization.

521329229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4613646.

The product of its digits is 19440, while the sum is 35.

The square root of 521329229 is about 22832.6351742413. The cubic root of 521329229 is about 804.8297565739.

The spelling of 521329229 in words is "five hundred twenty-one million, three hundred twenty-nine thousand, two hundred twenty-nine".