521318 has 16 divisors (see below), whose sum is σ = 933120. Its totient is φ = 213576.

The previous prime is 521317. The next prime is 521329. The reversal of 521318 is 813125.

521318 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 521318.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521318.

It is not an unprimeable number, because it can be changed into a prime (521317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488 + ... + 1131.

It is an arithmetic number, because the mean of its divisors is an integer number (58320).

2⁵²¹³¹⁸ is an apocalyptic number.

521318 is a deficient number, since it is larger than the sum of its proper divisors (411802).

521318 is a wasteful number, since it uses less digits than its factorization.

521318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651.

The product of its digits is 240, while the sum is 20.

The square root of 521318 is about 722.0235453224. The cubic root of 521318 is about 80.4823978077.

The spelling of 521318 in words is "five hundred twenty-one thousand, three hundred eighteen".