8581987 has 4 divisors (see below), whose sum is σ = 8589960. Its totient is φ = 8574016.

The previous prime is 8581981. The next prime is 8582017. The reversal of 8581987 is 7891858.

8581987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8581987 - 2¹¹ = 8579939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8581981) 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, 2062 + ... + 4627.

It is an arithmetic number, because the mean of its divisors is an integer number (2147490).

Almost surely, 2^8581987 is an apocalyptic number.

8581987 is a deficient number, since it is larger than the sum of its proper divisors (7973).

8581987 is a wasteful number, since it uses less digits than its factorization.

8581987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7972.

The product of its digits is 161280, while the sum is 46.

The square root of 8581987 is about 2929.5028588482. The cubic root of 8581987 is about 204.7368187240.

The spelling of 8581987 in words is "eight million, five hundred eighty-one thousand, nine hundred eighty-seven".