521375 has 16 divisors (see below), whose sum is σ = 672672. Its totient is φ = 403200.

The previous prime is 521369. The next prime is 521377. The reversal of 521375 is 573125.

It is not a de Polignac number, because 521375 - 2⁴ = 521359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5327 + ... + 5423.

It is an arithmetic number, because the mean of its divisors is an integer number (42042).

2⁵²¹³⁷⁵ is an apocalyptic number.

521375 is a deficient number, since it is larger than the sum of its proper divisors (151297).

521375 is an equidigital number, since it uses as much as digits as its factorization.

521375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 145 counting only the distinct ones).

The product of its digits is 1050, while the sum is 23.

The square root of 521375 is about 722.0630166405. The cubic root of 521375 is about 80.4853309691.

The spelling of 521375 in words is "five hundred twenty-one thousand, three hundred seventy-five".