521675521 has 4 divisors (see below), whose sum is σ = 521936944. Its totient is φ = 521414100.

The previous prime is 521675459. The next prime is 521675537. The reversal of 521675521 is 125576125.

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 521675521 - 2¹⁵ = 521642753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521675621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127695 + ... + 131716.

It is an arithmetic number, because the mean of its divisors is an integer number (130484236).

Almost surely, 2^521675521 is an apocalyptic number.

It is an amenable number.

521675521 is a deficient number, since it is larger than the sum of its proper divisors (261423).

521675521 is a wasteful number, since it uses less digits than its factorization.

521675521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261422.

The product of its digits is 21000, while the sum is 34.

The square root of 521675521 is about 22840.2171837310. The cubic root of 521675521 is about 805.0079193696.

The spelling of 521675521 in words is "five hundred twenty-one million, six hundred seventy-five thousand, five hundred twenty-one".