521273 has 4 divisors (see below), whose sum is σ = 527220. Its totient is φ = 515328.

The previous prime is 521267. The next prime is 521281. The reversal of 521273 is 372125.

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

It can be written as a sum of positive squares in 2 ways, for example, as 316969 + 204304 = 563^2 + 452^2 .

It is a cyclic number.

It is not a de Polignac number, because 521273 - 2¹² = 517177 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521243) 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, 2840 + ... + 3017.

It is an arithmetic number, because the mean of its divisors is an integer number (131805).

2⁵²¹²⁷³ is an apocalyptic number.

It is an amenable number.

521273 is a deficient number, since it is larger than the sum of its proper divisors (5947).

521273 is an equidigital number, since it uses as much as digits as its factorization.

521273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5946.

The product of its digits is 420, while the sum is 20.

The square root of 521273 is about 721.9923822313. The cubic root of 521273 is about 80.4800820029.

Adding to 521273 its reverse (372125), we get a palindrome (893398).

The spelling of 521273 in words is "five hundred twenty-one thousand, two hundred seventy-three".