9881587 has 4 divisors (see below), whose sum is σ = 9938880. Its totient is φ = 9824296.

The previous prime is 9881569. The next prime is 9881593. The reversal of 9881587 is 7851889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7851889 = 79 ⋅99391.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9881587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9881507) 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, 28387 + ... + 28732.

It is an arithmetic number, because the mean of its divisors is an integer number (2484720).

Almost surely, 2^9881587 is an apocalyptic number.

9881587 is a deficient number, since it is larger than the sum of its proper divisors (57293).

9881587 is a wasteful number, since it uses less digits than its factorization.

9881587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57292.

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

The square root of 9881587 is about 3143.4991649434. The cubic root of 9881587 is about 214.5897133072.

The spelling of 9881587 in words is "nine million, eight hundred eighty-one thousand, five hundred eighty-seven".