521340533 has 4 divisors (see below), whose sum is σ = 595817760. Its totient is φ = 446863308.

The previous prime is 521340527. The next prime is 521340541. The reversal of 521340533 is 335043125.

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 521340533 - 2²⁴ = 504563317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521340583) 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, 37238603 + ... + 37238616.

It is an arithmetic number, because the mean of its divisors is an integer number (148954440).

Almost surely, 2^521340533 is an apocalyptic number.

It is an amenable number.

521340533 is a deficient number, since it is larger than the sum of its proper divisors (74477227).

521340533 is an equidigital number, since it uses as much as digits as its factorization.

521340533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74477226.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 521340533 is about 22832.8827133150. The cubic root of 521340533 is about 804.8355735825.

Adding to 521340533 its reverse (335043125), we get a palindrome (856383658).

The spelling of 521340533 in words is "five hundred twenty-one million, three hundred forty thousand, five hundred thirty-three".