87531563 has 8 divisors (see below), whose sum is σ = 101008128. Its totient is φ = 74298024.

The previous prime is 87531559. The next prime is 87531571. The reversal of 87531563 is 36513578.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87531563 - 2² = 87531559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87531503) 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 7 ways as a sum of consecutive naturals, for example, 59981 + ... + 61422.

It is an arithmetic number, because the mean of its divisors is an integer number (12626016).

Almost surely, 2^87531563 is an apocalyptic number.

87531563 is a deficient number, since it is larger than the sum of its proper divisors (13476565).

87531563 is a wasteful number, since it uses less digits than its factorization.

87531563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121513.

The product of its digits is 75600, while the sum is 38.

The square root of 87531563 is about 9355.8304281341. The cubic root of 87531563 is about 444.0053752427.

The spelling of 87531563 in words is "eighty-seven million, five hundred thirty-one thousand, five hundred sixty-three".