521393 has 2 divisors, whose sum is σ = 521394. Its totient is φ = 521392.

The previous prime is 521377. The next prime is 521399. The reversal of 521393 is 393125.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 351649 + 169744 = 593^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 521393 - 2⁴ = 521377 is a prime.

It is not a weakly prime, because it can be changed into another prime (521399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260696 + 260697.

It is an arithmetic number, because the mean of its divisors is an integer number (260697).

2⁵²¹³⁹³ is an apocalyptic number.

It is an amenable number.

521393 is a deficient number, since it is larger than the sum of its proper divisors (1).

521393 is an equidigital number, since it uses as much as digits as its factorization.

521393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 23.

The square root of 521393 is about 722.0754808190. The cubic root of 521393 is about 80.4862571862.

The spelling of 521393 in words is "five hundred twenty-one thousand, three hundred ninety-three".