87521243 has 4 divisors (see below), whose sum is σ = 89886720. Its totient is φ = 85155768.

The previous prime is 87521237. The next prime is 87521251. The reversal of 87521243 is 34212578.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87521243 - 2⁸ = 87520987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87521293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1182683 + ... + 1182756.

It is an arithmetic number, because the mean of its divisors is an integer number (22471680).

Almost surely, 2^87521243 is an apocalyptic number.

87521243 is a deficient number, since it is larger than the sum of its proper divisors (2365477).

87521243 is a wasteful number, since it uses less digits than its factorization.

87521243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2365476.

The product of its digits is 13440, while the sum is 32.

The square root of 87521243 is about 9355.2788841381. The cubic root of 87521243 is about 443.9879250970.

The spelling of 87521243 in words is "eighty-seven million, five hundred twenty-one thousand, two hundred forty-three".