522509 has 4 divisors (see below), whose sum is σ = 562716. Its totient is φ = 482304.

The previous prime is 522497. The next prime is 522517. The reversal of 522509 is 905225.

522509 = T₂₇₇ + T₂₇₈ + ... + T₂₈₉.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96100 + 426409 = 310^2 + 653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-522509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (522569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20084 + ... + 20109.

It is an arithmetic number, because the mean of its divisors is an integer number (140679).

2⁵²²⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

522509 is a deficient number, since it is larger than the sum of its proper divisors (40207).

522509 is a wasteful number, since it uses less digits than its factorization.

522509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40206.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 522509 is about 722.8478401434. The cubic root of 522509 is about 80.5436410617.

The spelling of 522509 in words is "five hundred twenty-two thousand, five hundred nine".