521329 has 2 divisors, whose sum is σ = 521330. Its totient is φ = 521328.

The previous prime is 521317. The next prime is 521357. The reversal of 521329 is 923125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490000 + 31329 = 700^2 + 177^2 .

It is a cyclic number.

It is not a de Polignac number, because 521329 - 2⁷ = 521201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (521309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260664 + 260665.

It is an arithmetic number, because the mean of its divisors is an integer number (260665).

2⁵²¹³²⁹ is an apocalyptic number.

It is an amenable number.

521329 is a deficient number, since it is larger than the sum of its proper divisors (1).

521329 is an equidigital number, since it uses as much as digits as its factorization.

521329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 22.

The square root of 521329 is about 722.0311627624. The cubic root of 521329 is about 80.4829638730.

The spelling of 521329 in words is "five hundred twenty-one thousand, three hundred twenty-nine".