521349 has 4 divisors (see below), whose sum is σ = 695136. Its totient is φ = 347564.

The previous prime is 521329. The next prime is 521357. The reversal of 521349 is 943125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 521349 - 2⁵ = 521317 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86889 + ... + 86894.

It is an arithmetic number, because the mean of its divisors is an integer number (173784).

2⁵²¹³⁴⁹ is an apocalyptic number.

It is an amenable number.

521349 is a deficient number, since it is larger than the sum of its proper divisors (173787).

521349 is a wasteful number, since it uses less digits than its factorization.

521349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173786.

The product of its digits is 1080, while the sum is 24.

The square root of 521349 is about 722.0450124473. The cubic root of 521349 is about 80.4839930623.

The spelling of 521349 in words is "five hundred twenty-one thousand, three hundred forty-nine".