9661887 has 12 divisors (see below), whose sum is σ = 13983840. Its totient is φ = 6428448.

The previous prime is 9661871. The next prime is 9661889. The reversal of 9661887 is 7881669.

It is a happy number.

9661887 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9661887 - 2⁴ = 9661871 is a prime.

It is a plaindrome in base 8.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9661889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6618 + ... + 7944.

It is an arithmetic number, because the mean of its divisors is an integer number (1165320).

Almost surely, 2^9661887 is an apocalyptic number.

9661887 is a deficient number, since it is larger than the sum of its proper divisors (4321953).

9661887 is a wasteful number, since it uses less digits than its factorization.

9661887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142 (or 2139 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 9661887 is about 3108.3576049097. The cubic root of 9661887 is about 212.9874356141.

The spelling of 9661887 in words is "nine million, six hundred sixty-one thousand, eight hundred eighty-seven".