9687881 has 4 divisors (see below), whose sum is σ = 11071872. Its totient is φ = 8303892.

The previous prime is 9687877. The next prime is 9687889. The reversal of 9687881 is 1887869.

9687881 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 Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1887869 = 31 ⋅60899.

It is a cyclic number.

It is not a de Polignac number, because 9687881 - 2² = 9687877 is a prime.

It is a super-2 number, since 2×9687881² = 187710076540322, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9687889) 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, 691985 + ... + 691998.

It is an arithmetic number, because the mean of its divisors is an integer number (2767968).

Almost surely, 2^9687881 is an apocalyptic number.

It is an amenable number.

9687881 is a deficient number, since it is larger than the sum of its proper divisors (1383991).

9687881 is a wasteful number, since it uses less digits than its factorization.

9687881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383990.

The product of its digits is 193536, while the sum is 47.

The square root of 9687881 is about 3112.5361042083. The cubic root of 9687881 is about 213.1782692071.

The spelling of 9687881 in words is "nine million, six hundred eighty-seven thousand, eight hundred eighty-one".