521143 has 4 divisors (see below), whose sum is σ = 595600. Its totient is φ = 446688.

The previous prime is 521137. The next prime is 521153. The reversal of 521143 is 341125.

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

It is a cyclic number.

It is not a de Polignac number, because 521143 - 2⁹ = 520631 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 (521153) 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, 37218 + ... + 37231.

It is an arithmetic number, because the mean of its divisors is an integer number (148900).

2⁵²¹¹⁴³ is an apocalyptic number.

521143 is a deficient number, since it is larger than the sum of its proper divisors (74457).

521143 is an equidigital number, since it uses as much as digits as its factorization.

521143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74456.

The product of its digits is 120, while the sum is 16.

The square root of 521143 is about 721.9023479668. The cubic root of 521143 is about 80.4733911515.

Adding to 521143 its reverse (341125), we get a palindrome (862268).

The spelling of 521143 in words is "five hundred twenty-one thousand, one hundred forty-three".