87000521 has 4 divisors (see below), whose sum is σ = 87133200. Its totient is φ = 86867844.

The previous prime is 87000499. The next prime is 87000533. The reversal of 87000521 is 12500078.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12500078 = 2 ⋅6250039.

It is a cyclic number.

It is not a de Polignac number, because 87000521 - 2²⁶ = 19891657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87009521) 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, 65351 + ... + 66668.

It is an arithmetic number, because the mean of its divisors is an integer number (21783300).

Almost surely, 2^87000521 is an apocalyptic number.

It is an amenable number.

87000521 is a deficient number, since it is larger than the sum of its proper divisors (132679).

87000521 is a wasteful number, since it uses less digits than its factorization.

87000521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132678.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 87000521 is about 9327.4069815785. The cubic root of 87000521 is about 443.1056466794.

Adding to 87000521 its reverse (12500078), we get a palindrome (99500599).

The spelling of 87000521 in words is "eighty-seven million, five hundred twenty-one", and thus it is an aban number.