521673 has 4 divisors (see below), whose sum is σ = 695568. Its totient is φ = 347780.

The previous prime is 521671. The next prime is 521693. The reversal of 521673 is 376125.

521673 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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 521673 - 2¹ = 521671 is a prime.

It is a D-number.

521673 is strictly pandigital in base 7.

It is not an unprimeable number, because it can be changed into a prime (521671) 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, 86943 + ... + 86948.

It is an arithmetic number, because the mean of its divisors is an integer number (173892).

2⁵²¹⁶⁷³ is an apocalyptic number.

It is an amenable number.

521673 is a deficient number, since it is larger than the sum of its proper divisors (173895).

521673 is a wasteful number, since it uses less digits than its factorization.

521673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173894.

The product of its digits is 1260, while the sum is 24.

The square root of 521673 is about 722.2693403433. The cubic root of 521673 is about 80.5006622632.

Adding to 521673 its reverse (376125), we get a palindrome (897798).

The spelling of 521673 in words is "five hundred twenty-one thousand, six hundred seventy-three".