521565241 has 4 divisors (see below), whose sum is σ = 522627984. Its totient is φ = 520502500.

The previous prime is 521565221. The next prime is 521565271. The reversal of 521565241 is 142565125.

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 521565241 - 2¹¹ = 521563193 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521565221) 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, 530635 + ... + 531616.

It is an arithmetic number, because the mean of its divisors is an integer number (130656996).

Almost surely, 2^521565241 is an apocalyptic number.

It is an amenable number.

521565241 is a deficient number, since it is larger than the sum of its proper divisors (1062743).

521565241 is a wasteful number, since it uses less digits than its factorization.

521565241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062742.

The product of its digits is 12000, while the sum is 31.

The square root of 521565241 is about 22837.8028934484. The cubic root of 521565241 is about 804.9511902816.

The spelling of 521565241 in words is "five hundred twenty-one million, five hundred sixty-five thousand, two hundred forty-one".