525409 has 2 divisors, whose sum is σ = 525410. Its totient is φ = 525408.

The previous prime is 525397. The next prime is 525431. The reversal of 525409 is 904525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342225 + 183184 = 585^2 + 428^2 .

It is a cyclic number.

It is not a de Polignac number, because 525409 - 2⁵ = 525377 is a prime.

525409 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (525439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262704 + 262705.

It is an arithmetic number, because the mean of its divisors is an integer number (262705).

2⁵²⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

525409 is a deficient number, since it is larger than the sum of its proper divisors (1).

525409 is an equidigital number, since it uses as much as digits as its factorization.

525409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 525409 is about 724.8510191757. The cubic root of 525409 is about 80.6923758259.

The spelling of 525409 in words is "five hundred twenty-five thousand, four hundred nine".