522391 has 2 divisors, whose sum is σ = 522392. Its totient is φ = 522390.

The previous prime is 522383. The next prime is 522409. The reversal of 522391 is 193225.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 522391 - 2³ = 522383 is a prime.

It is equal to p₄₃₂₄₉ and since 522391 and 43249 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (522371) 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, 261195 + 261196.

It is an arithmetic number, because the mean of its divisors is an integer number (261196).

2⁵²²³⁹¹ is an apocalyptic number.

522391 is a deficient number, since it is larger than the sum of its proper divisors (1).

522391 is an equidigital number, since it uses as much as digits as its factorization.

522391 is an odious number, because the sum of its binary digits is odd.

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

The square root of 522391 is about 722.7662139309. The cubic root of 522391 is about 80.5375774563.

The spelling of 522391 in words is "five hundred twenty-two thousand, three hundred ninety-one".