521340329 has 2 divisors, whose sum is σ = 521340330. Its totient is φ = 521340328.

The previous prime is 521340317. The next prime is 521340349. The reversal of 521340329 is 923043125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 454542400 + 66797929 = 21320^2 + 8173^2 .

It is a cyclic number.

It is not a de Polignac number, because 521340329 - 2⁸ = 521340073 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (521340349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260670164 + 260670165.

It is an arithmetic number, because the mean of its divisors is an integer number (260670165).

Almost surely, 2^521340329 is an apocalyptic number.

It is an amenable number.

521340329 is a deficient number, since it is larger than the sum of its proper divisors (1).

521340329 is an equidigital number, since it uses as much as digits as its factorization.

521340329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 521340329 is about 22832.8782460731. The cubic root of 521340329 is about 804.8354686054.

The spelling of 521340329 in words is "five hundred twenty-one million, three hundred forty thousand, three hundred twenty-nine".