521373 has 8 divisors (see below), whose sum is σ = 736128. Its totient is φ = 327104.

The previous prime is 521369. The next prime is 521377. The reversal of 521373 is 373125.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (521369) and next prime (521377).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521373 - 2² = 521369 is a prime.

521373 is a lucky number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 5061 + ... + 5162.

It is an arithmetic number, because the mean of its divisors is an integer number (92016).

2⁵²¹³⁷³ is an apocalyptic number.

It is an amenable number.

521373 is a deficient number, since it is larger than the sum of its proper divisors (214755).

521373 is a wasteful number, since it uses less digits than its factorization.

521373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10243.

The product of its digits is 630, while the sum is 21.

The square root of 521373 is about 722.0616317185. The cubic root of 521373 is about 80.4852280548.

Adding to 521373 its reverse (373125), we get a palindrome (894498).

The spelling of 521373 in words is "five hundred twenty-one thousand, three hundred seventy-three".