521371 has 4 divisors (see below), whose sum is σ = 532512. Its totient is φ = 510232.

The previous prime is 521369. The next prime is 521377. The reversal of 521371 is 173125.

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

It is not a de Polignac number, because 521371 - 2¹ = 521369 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5500 + ... + 5593.

It is an arithmetic number, because the mean of its divisors is an integer number (133128).

2⁵²¹³⁷¹ is an apocalyptic number.

521371 is a deficient number, since it is larger than the sum of its proper divisors (11141).

521371 is a wasteful number, since it uses less digits than its factorization.

521371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11140.

The product of its digits is 210, while the sum is 19.

The square root of 521371 is about 722.0602467939. The cubic root of 521371 is about 80.4851251402.

Adding to 521371 its reverse (173125), we get a palindrome (694496).

The spelling of 521371 in words is "five hundred twenty-one thousand, three hundred seventy-one".