521897 has 2 divisors, whose sum is σ = 521898. Its totient is φ = 521896.

The previous prime is 521887. The next prime is 521903. The reversal of 521897 is 798125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434281 + 87616 = 659^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 521897 - 2⁴ = 521881 is a prime.

It is not a weakly prime, because it can be changed into another prime (521887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260948 + 260949.

It is an arithmetic number, because the mean of its divisors is an integer number (260949).

2⁵²¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

521897 is a deficient number, since it is larger than the sum of its proper divisors (1).

521897 is an equidigital number, since it uses as much as digits as its factorization.

521897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 521897 is about 722.4243905074. The cubic root of 521897 is about 80.5121826141.

The spelling of 521897 in words is "five hundred twenty-one thousand, eight hundred ninety-seven".