87021525 has 12 divisors (see below), whose sum is σ = 143875712. Its totient is φ = 46411440.

The previous prime is 87021523. The next prime is 87021527. The reversal of 87021525 is 52512078.

It is an interprime number because it is at equal distance from previous prime (87021523) and next prime (87021527).

It is not a de Polignac number, because 87021525 - 2¹ = 87021523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87021492 and 87021501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87021523) 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, 580069 + ... + 580218.

Almost surely, 2^87021525 is an apocalyptic number.

It is an amenable number.

87021525 is a deficient number, since it is larger than the sum of its proper divisors (56854187).

87021525 is a wasteful number, since it uses less digits than its factorization.

87021525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160300 (or 1160295 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 87021525 is about 9328.5328428430. The cubic root of 87021525 is about 443.1413025660.

The spelling of 87021525 in words is "eighty-seven million, twenty-one thousand, five hundred twenty-five".