520454521 has 4 divisors (see below), whose sum is σ = 520521552. Its totient is φ = 520387492.

The previous prime is 520454491. The next prime is 520454531. The reversal of 520454521 is 125454025.

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 520454521 - 2⁵ = 520454489 is a prime.

It is a super-3 number, since 3×520454521³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520454521.

It is not an unprimeable number, because it can be changed into a prime (520454531) 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, 20071 + ... + 37996.

It is an arithmetic number, because the mean of its divisors is an integer number (130130388).

Almost surely, 2^520454521 is an apocalyptic number.

It is an amenable number.

520454521 is a deficient number, since it is larger than the sum of its proper divisors (67031).

520454521 is an equidigital number, since it uses as much as digits as its factorization.

520454521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67030.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 520454521 is about 22813.4723573594. The cubic root of 520454521 is about 804.3793789088.

The spelling of 520454521 in words is "five hundred twenty million, four hundred fifty-four thousand, five hundred twenty-one".