87575521 has 4 divisors (see below), whose sum is σ = 95536944. Its totient is φ = 79614100.

The previous prime is 87575497. The next prime is 87575531. The reversal of 87575521 is 12557578.

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 87575521 - 2⁷ = 87575393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87575531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3980695 + ... + 3980716.

It is an arithmetic number, because the mean of its divisors is an integer number (23884236).

Almost surely, 2^87575521 is an apocalyptic number.

It is an amenable number.

87575521 is a deficient number, since it is larger than the sum of its proper divisors (7961423).

87575521 is a wasteful number, since it uses less digits than its factorization.

87575521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7961422.

The product of its digits is 98000, while the sum is 40.

The square root of 87575521 is about 9358.1793635301. The cubic root of 87575521 is about 444.0796887105.

The spelling of 87575521 in words is "eighty-seven million, five hundred seventy-five thousand, five hundred twenty-one".