521073 has 20 divisors (see below), whose sum is σ = 890560. Its totient is φ = 297432.

The previous prime is 521063. The next prime is 521107. The reversal of 521073 is 370125.

It is not a de Polignac number, because 521073 - 2⁵ = 521041 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521073.

It is not an unprimeable number, because it can be changed into a prime (521023) 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 19 ways as a sum of consecutive naturals, for example, 108 + ... + 1026.

It is an arithmetic number, because the mean of its divisors is an integer number (44528).

2⁵²¹⁰⁷³ is an apocalyptic number.

It is an amenable number.

521073 is a deficient number, since it is larger than the sum of its proper divisors (369487).

521073 is an equidigital number, since it uses as much as digits as its factorization.

521073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 521073 is about 721.8538633269. The cubic root of 521073 is about 80.4697879245.

Adding to 521073 its reverse (370125), we get a palindrome (891198).

The spelling of 521073 in words is "five hundred twenty-one thousand, seventy-three".