87521571 has 12 divisors (see below), whose sum is σ = 126893520. Its totient is φ = 58129200.

The previous prime is 87521569. The next prime is 87521573. The reversal of 87521571 is 17512578.

87521571 is a `hidden beast` number, since 87 + 5 + 2 + 1 + 571 = 666.

It is an interprime number because it is at equal distance from previous prime (87521569) and next prime (87521573).

It is not a de Polignac number, because 87521571 - 2¹ = 87521569 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (87521573) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15655 + ... + 20496.

It is an arithmetic number, because the mean of its divisors is an integer number (10574460).

Almost surely, 2^87521571 is an apocalyptic number.

87521571 is a deficient number, since it is larger than the sum of its proper divisors (39371949).

87521571 is a wasteful number, since it uses less digits than its factorization.

87521571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36426 (or 36423 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 87521571 is about 9355.2964143313. The cubic root of 87521571 is about 443.9884797352.

The spelling of 87521571 in words is "eighty-seven million, five hundred twenty-one thousand, five hundred seventy-one".