520752221 has 4 divisors (see below), whose sum is σ = 568093344. Its totient is φ = 473411100.

The previous prime is 520752203. The next prime is 520752233. The reversal of 520752221 is 122257025.

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 520752221 - 2⁶ = 520752157 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 (520712221) 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, 23670545 + ... + 23670566.

It is an arithmetic number, because the mean of its divisors is an integer number (142023336).

Almost surely, 2^520752221 is an apocalyptic number.

It is an amenable number.

520752221 is a deficient number, since it is larger than the sum of its proper divisors (47341123).

520752221 is a wasteful number, since it uses less digits than its factorization.

520752221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47341122.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 520752221 is about 22819.9960780014. The cubic root of 520752221 is about 804.5327180180.

The spelling of 520752221 in words is "five hundred twenty million, seven hundred fifty-two thousand, two hundred twenty-one".