525391 has 2 divisors, whose sum is σ = 525392. Its totient is φ = 525390.

The previous prime is 525379. The next prime is 525397. The reversal of 525391 is 193525.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 525391 - 2⁵ = 525359 is a prime.

It is a d-powerful number, because it can be written as 5 + 2¹⁹ + 3⁵ + 5³ + 9³ + 1 .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262695 + 262696.

It is an arithmetic number, because the mean of its divisors is an integer number (262696).

2⁵²⁵³⁹¹ is an apocalyptic number.

525391 is a deficient number, since it is larger than the sum of its proper divisors (1).

525391 is an equidigital number, since it uses as much as digits as its factorization.

525391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1350, while the sum is 25.

The square root of 525391 is about 724.8386027248. The cubic root of 525391 is about 80.6914543347.

The spelling of 525391 in words is "five hundred twenty-five thousand, three hundred ninety-one".