521085329 has 2 divisors, whose sum is σ = 521085330. Its totient is φ = 521085328.

The previous prime is 521085307. The next prime is 521085379. The reversal of 521085329 is 923580125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 520752400 + 332929 = 22820^2 + 577^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521085329 is a prime.

It is not a weakly prime, because it can be changed into another prime (521085379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260542664 + 260542665.

It is an arithmetic number, because the mean of its divisors is an integer number (260542665).

Almost surely, 2^521085329 is an apocalyptic number.

It is an amenable number.

521085329 is a deficient number, since it is larger than the sum of its proper divisors (1).

521085329 is an equidigital number, since it uses as much as digits as its factorization.

521085329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 521085329 is about 22827.2935101821. The cubic root of 521085329 is about 804.7042257917.

The spelling of 521085329 in words is "five hundred twenty-one million, eighty-five thousand, three hundred twenty-nine".