521428441 has 4 divisors (see below), whose sum is σ = 526301712. Its totient is φ = 516555172.

The previous prime is 521428429. The next prime is 521428459. The reversal of 521428441 is 144824125.

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 521428441 - 2⁵ = 521428409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521428421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2436475 + ... + 2436688.

It is an arithmetic number, because the mean of its divisors is an integer number (131575428).

Almost surely, 2^521428441 is an apocalyptic number.

It is an amenable number.

521428441 is a deficient number, since it is larger than the sum of its proper divisors (4873271).

521428441 is a wasteful number, since it uses less digits than its factorization.

521428441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4873270.

The product of its digits is 10240, while the sum is 31.

The square root of 521428441 is about 22834.8076628642. The cubic root of 521428441 is about 804.8808079382.

The spelling of 521428441 in words is "five hundred twenty-one million, four hundred twenty-eight thousand, four hundred forty-one".